\(27-\left(14-x\right)=-x+3\)

\(\Leftrightarrow\)\(27-14+x=-x+3\)

\(\Leftrightarrow\)\(13+x=-x+3\)

\(\Leftrightarrow\)\(2x=-10\)

\(\Leftrightarrow\)\(x=-5\)

Vậy...

Câu 1 :

=> 27-14+x = -x+3

=> 13+x = -x+3

=> x = -x+3-13 = -x-10

=> 10 = -x-x = -2x

=> x = 10 : (-2) = -5

Vậy x = -5

Tk mk nha

3x - 82 = 2-x

=> 3x+x = 2+82

=> 4x = 84

=> x = 84 : 4

=> x = 21

vậy_____

305 + x + 14 = 48 - ( x - 23)

=> 319 + x = 48 - x + 23

=> 319 + x = 71 - x

=> x+x = 71 - 319

=> 2x = -248

=> x = -248 : 2

=> x = -124

vậy____

3x - 82 = 2 - x

<=> 3x + x = 2 + 82

<=> 4x = 84

<=> x = \(\frac{84}{4}\)= 21

Bài làm:

Ta có: \(\left(\frac{1}{2}x+\frac{3}{4}\right)^2\div\left(-\frac{3}{14}\right)=-\frac{7}{24}\)

\(\Leftrightarrow\left(\frac{1}{2}x+\frac{3}{4}\right)^2=\frac{1}{16}=\left(\frac{1}{4}\right)^2\)

\(\Leftrightarrow\orbr{\begin{cases}\frac{1}{2}x+\frac{3}{4}=\frac{1}{4}\\\frac{1}{2}x+\frac{3}{4}=-\frac{1}{4}\end{cases}}\Leftrightarrow\orbr{\begin{cases}\frac{1}{2}x=-\frac{1}{2}\\\frac{1}{2}x=-1\end{cases}}\Rightarrow\orbr{\begin{cases}x=-1\\x=-2\end{cases}}\)

(\(\frac{1}{2}\).x+\(\frac{3}{4}\))²: \(\frac{-3}{14}\)=\(\frac{-7}{24}\)
  (\(\frac{1}{2}\).x+\(\frac{3}{4}\))² =\(\frac{1}{16}\)
   (\(\frac{1}{2}\).x+\(\frac{3}{4}\))²=(\(\frac{1}{4}\))²
\(\hept{\begin{cases}\frac{1}{2}.x+\frac{3}{4}=\frac{1}{4}\\\frac{1}{2}.x+\frac{3}{4}=\frac{-1}{4}\end{cases}}\)<=>\(\hept{\begin{cases}\frac{1}{2}.x=\frac{1}{4}-\frac{3}{4}\\\frac{1}{2}.x=\frac{-1}{4}-\frac{3}{4}\end{cases}}\)<=>\(\hept{\begin{cases}\frac{1}{2}.x=-\frac{1}{2}\\\frac{1}{2}.x=-1\end{cases}}\)
<=>\(\hept{\begin{cases}x=\frac{-1}{2}:\frac{1}{2}=-1\\x=-1:\frac{1}{2}=-2\end{cases}}\)

khó quá ??????????????????????????????????

a) (-2) . ( x+7 ) + (-5) = 7 

<=>(-2).(x+7)=7+5

<=>x+7=12:(-2)

<=>x+7=-6

<=>x=(-6)-7

<=>x=-13

Vậy x=-13

b)(x+4) : (-7) = 14

<=>x+4=14 x (-7)

<=>x+4=-98

<=>x=-98-4

<=>x=-102

Vậy x= -102

c) 72 : ( x+5) - 4 = -12 

<=>72:(x+5)=(-12)+4

<=>x+5=72:(-8)

<=>x+5=-9

<=>x=-9-5

<=>x=-14

Vậy x= -14

d) (x+3) : (-6 ) + 12 = 8 

<=>(x+3) :(-6)=8-12

<=>x+3=(-4)x(-6)

<=>x+3=24

<=>x=24-3

<=>x=21

Vậy x= 21