ПОМОГИТЕ
Раскрыть скобки:а)12(5а-6),б)(х-9)х11,в)7(5х+7у-6а),г)(12а+15в-25с)х3
Решить уравнения:а)48:(х+3)=4,б)(х+7):8=9,в)48:х+3=4
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