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Cum se rezolva exerciții de genul : (x+20):12+68=78

Răspuns :

(x+20):12=78-68
x+20=10x12
x=120-20
x=100
(x+20):12+68=78
(x+20):12=78-68=10
(x+20):12=10
x+20=12×10=120
x=120-20=100
x=100