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510+14x=762
14✖(12-x)=70


Răspuns :

14x=762-510
14x=252
x=252:14
x=18


168-14x=70
168-70=14x
98=14x
x=98:14
x=7
510 + 14x = 762
14 X ( 12-x ) =70
12-x=70 : 14
12-x=5
x=12-5
x=7 !