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15*(18-x)=180
63:(x-2)=7
14x+28x=588
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Răspuns :

15*(18-x)=180
18-x=180/15
18-x=12
x=18-12
x=6

63:(x-2)=7
63=7x-14
63+14=7x
77=7x
x=77/7
x=11

14x+28x=588

42x=588
x=588/42
x=15