-12(x-5)+7(3-x)=5
=> -12x+60+21-7x=5
=> -19x=-76
=> x= 4
<=>(-12)(x-5)+7(3-x)=-(19x-81)
=>-(19x-81)=5
<=>81-19x=5
=>-19x=-76
=>x=(-76):(-19)
=>x=4
=> - 12x + 60 + 21 - 7x = 5 => - 12x - 7x + ( 60 + 21 ) = 5 => - 19x + 81 = 5=> x = [ 5 + ( - 8 ) ] : ( - 19 ) = 5
Vậy x = 5
-12(x-5)+7(3-x) =5
-12x+60 + 21-7x= 5
-12x-7x+ 81=5
-19x =(-76)
x=4
Vậy x=4