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Care este varianta corecta ??? (X+15)×10-100÷5+90=100 sau. [(X+15)×10-100]:5+90=100

Răspuns :

[(x+15 ) x10 -100]:5 +90 = 100  
 [(x+15) x10 - 100]:5= 100-90
(x+15) x10  - 100= 10x5
(x+15) x10 -100 =50
(x+15) x10 = 50+100
(x+15) x10=150
x+15 =150:10
x+15=15
x=15-15
x=0