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nr.necunoscut:5(x+3)+2(x+3)=56

Răspuns :

5x+15+2x+6=56
7x+21=56
7x=35
x=5
5(x+3)+2(x+3)=56
5x+3+2x+3=56
5x+2x=56-6
7x=50
x=50/7