Question

60-30=x+15 решите поззи

Answer 1

$60-30=x+15 \ x=60-30-15 \ x=15$

Answer 2

60-30=x+15
x+15=60-30
x+15=30
x=30-15
x=15
_________
60-30=15+15
60-30=30
30=30