Question

84:(x-3)=12 si alt exercitiu 3*(4+5x)=72

Answer 1

84:(x-3)=12
x-3=84:12
x-3=7
x=7+3
x=10


3*(4+5x)=72
12+15x=72
15x=72-12
15x=60
x=4

Answer 2

84 : (x-3) = 12 =>  x-3 = 12 * 84 =>   x-3 = 1008 =>  x = 1008:3 =>  x=336


3*(4+5x) = 72  =>  12 + 15x = 72 =>  15x = 72 - 12  => 5x= 60 => x= 60:5 => x=12