-12(x-5) + 7(3-x) = 5
-12x + 60 + 21 - 7x = 5
-12x - 7x = 5 + (-60) + (-21)
-12x + (-7x) = -76
-19x = -76
19x = 76
x = 76 : 19
x = 4
Vậy x = 4
k mk nha bn
\(-12\left(x-5\right)+7\left(3-x\right)=5\)
\(-12x+60+21-7x=5\)
\(-19x+81=5\)
\(-19x=5-81\)
\(-19x=-76\)
\(x=4\)
Vậy \(x=4\)