\(-12\times\left(x-5\right)+7\times\left(3-x\right)=5\)
\(-12\times x+12\times5+7\times3-7\times x=5\)
\(x\times\left(-12-7\right)+\left(60+21\right)=5\)
\(x\times\left(-19\right)+81=5\)
\(x\times\left(-19\right)=5-81\)
\(x\times\left(-19\right)=-76\)
\(x=\frac{-76}{-19}\)
\(x=4\)
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
\(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(-12x+60+21-7x=5\)
\(-12x-7x=5-60-21\)
\(-19x=-76\)
\(x=4\)