\(-12\times\left(x-5\right)+7\times\left(3-x\right)=5\)

\(-12\times x+12\times5+7\times3-7\times x=5\)

\(x\times\left(-12-7\right)+\left(60+21\right)=5\)

\(x\times\left(-19\right)+81=5\)

\(x\times\left(-19\right)=5-81\)

\(x\times\left(-19\right)=-76\)

\(x=\frac{-76}{-19}\)

\(x=4\)

Chúc bạn học tốt

-12 ( x - 5 ) + 7 ( 3 - x ) = 5

-12x - ( -12 ) . 5 + 7 . 3 - 7x = 5

-12x - ( - 60 ) + 21 - 7x = 5

-12x - 7x - ( - 60 ) + 21 = 5

x . ( - 12 - 7 ) - [( - 60 ) - 21 )] = 5

-19x - ( - 81 ) = 5

-19x = 5 + ( -81 )

-19x = -76

      x = (-76) : ( -19)

      x = 4

Vậy x = 4

\(-12\left(x-5\right)+7\left(3-x\right)=5\)

\(-12x+60+21-7x=5\)

\(-12x-7x=5-60-21\)

\(-19x=-76\)

\(x=4\)

a) <=> 15-5x-20=-12-3

<=> -5x=-12-3-15+20=-10

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

b)<=>7-x-25-7=-25

<=> -x=-25-7+25+7=0 =>x=0

c) /x+2/=0 => x+2=0 =>x=-2

d) sai đề

e)<=> /x-5/ = 7

<=> \(\orbr{\begin{cases}x-5=7\\x-5=-7\end{cases}}\)

<=> \(\orbr{\begin{cases}x=12\\x=-2\end{cases}}\)

g) <=> -x-20-8+2x=-15

<=> x=-15+20+8=13

d là | x + 3 | = 7 - ( - 2 )

- 12.[ x - 5 ] + 7.[ 3 - x ] = 5

=> - 12x + 60 + 21 - 7x = 5

=> ( - 12x - 7x ) + 60 + 21 = 5

=> - 19x + 81 = 5

=> - 19x = 5 - 81

=> - 19x = - 76

=> x = ( - 76 ) : ( - 19 )

=> x = 4

Vậy x = 4

-12(x-5)+7(3-x)=5

<=>(-12x)-(-60)+21-7x=5

<=>(-12x)+60+21-7x=5

<=>(-12x-7x)+81=5

<=>(-19x)=5-81=-76

<=>x=(-76):(-19)

<=>x=4

VẬy x=4

sẽ bằng: -12.x-(-12).5+7.3-7.x=5

= -12x+60+21-7x=5

Áp dụng quy tắc chuyển vế ta sẽ có

-12x-7x= 5-60-21= -76

-19x= -76 => x= -76/-19=4

-12x+60+21-7x=5

-12x-7x=-60-21+5

-19x=-76

x=4

-12.x + 12.5+7.3-7.x=5

-12.x+ 60+21-7.x=5

-19.x=76

=> không có x

<=>(-12)(x-5)+7(3-x)=-(19x-81)

=>-(19x-81)=5

<=>81-19x=5

=>-19x=-76

=>x=(-76):(-19)

=>x=4

(-12) (x - 5) + 7(3 - x) = 5

=> -12x + 60 + 21 - 7x - 5 = 0

=> -19x + 76 = 0

=> -19x = -76

=> x = 4

-12(x-5)+7(3-x)=5

<=>(-12x)-(-60)+21-7x=5

<=>(-12x)+60+21-7x=5

<=>(-12x-7x)+81=5

<=>(-19x)=-76<=>x=4

 vậy x=4

- 12.( x - 5 ) + 7.( 3 - x ) = 5

=> - 12x + 60 + 21 - 7x = 5

=> ( - 12x - 7x ) + 60 + 21 = 5

=> - 19x + 81 = 5

=> - 19x = 5 - 81

=> - 19x = - 76

=> x = ( - 76 ) : ( - 19 )

=> x = 4

Vậy x = 4

-12x+60+21=5

-12x+81=5

-12x=-76

x=19/3         k nha