Question

Quantos que e 30-20+2x=10

Answer 1

$30-20+2x=10\\2x=10-30+20\\2x=0\\x=0/2\\x=0$

Answer 2

30-20+2x=10
10+2x=10
isolamos x
2x=10-10
2x=0
x=0/2
x=0