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3(2x-4)=60
2x+5x+7x=140
raspundeti varog la intrebare.


Răspuns :

3(2x-4)=60
6x-12=60
6x=60+12
6x=72
x=72:6
x=12

2x+5x+7x=140
14x=140
x=140:14
x=10