Помогите пожалуйста
Упростите выражение:
А)a(b+3)+b(a+3)-3(a+b)
Б)2(x-y)+6(y-x)-(4x-4y)
B)a(b+c)-b(a+c)-c(a+b)
Г)m(n-l)+n(l-m)+l(m-n)
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