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11(120-y)=13y
Cum se face?


Răspuns :

desfaci paranteza. 1320 - 11y =13 y => 1320 = 24y si y =1320/24=55
11(120-y)=13y
1320-11y=13y
1320=13y+11y
y=1320:24
y=55