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9*(2x+1)=153 AFLATI X
14x-28x=588 AFLATI X


Răspuns :

9*(2x+1)=153
2x+1=153:9=17
2x=17-1=16
x=16:2
x=8

14x-28x=588????
este gresit?

9*(2x+1)=153 | :9
2x+1=17 | -1
2x=16 | :2
x=8

14x-28x=588 | -28x
-14x=588 | :-14
x= -42