[(x+15)ori10-100]:5+90=100

Răspuns :

[(x+15)×10-100]:5+90=100
[(x+15)×10-100]:5=100-90
[(x+15)×10-100]:5=10
(x+15)×10-100=10×5
(x+15)×10-100=50
(x+15)×10=50+100
(x+15)×10=150
x+15=150:10
x+15=15
x=15-15
x=0