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b. [(x + 15) x 10 - 100] :5 +90 = 100
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Va rog repede dau coroana!


Răspuns :

Explicație pas cu pas:

[(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