Розкрийте дужки і спростіть вираз
а)а-(а-b)=
б)a+(a+b)=
в)(x-3,12+y)-(2x+4y)=
г)2(3x-5y)+4(2x+y)=
ґ)-b(2+a)-3(a+b)+aby=
Срочно дам 75 балов
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