(m+3)-(6m+5)-(m-1)(x-y)+(x-y)-(2x+y)тема: приведение подобных слагаемых
M+3-6m-5-m+1=-1-6m
X-y+x-y-2x-y=x-3y
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M+3-6m-5-m+1=-1-6m
X-y+x-y-2x-y=x-3y