Question

[(X+15)×10-100]:5+90=100 Afla valoarea lui X

Answer 1

[(X+15)×10-100]:5 = 100 - 90
[(X+15)×10-100]:5 = 10 
(X+15)×10-100 = 10 x 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

Answer 2

[(X+15)×10-100]:5+90=100
[10X+150-100]:5+90=100
[10X+50]:5+90=100
10X+50/5 +90=100 {la ,,10X si 50, totul e supra 5} {amplifici 90 si 100 cu 5}
10X+50+450=500
10X+500=500
10X=500-500
10X=0
X=0:10
X=0