Question

(40-2x)3=40-x
Решите уравнение

Answer 1

(40-2x)*3=40-x
120-6x=40-x
120-40=6x-x
80=5x
16=x
x=16

Answer 2

120-6x=40-x ; -6x+x=40-120; -5x=-80; x=-80:(-5); x=16