упростить: 1) 3(a-b)-2(a-b)=  2) 4(x+y)+5(2x-y)= привидите подобные слагаемые, раскройте скобки: 1) (3x+y)-(-x-4y)= 2) (x+6y)-(8x-7y)= 3) (m+n)-(m-n)=
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