а) (x-y)+(x+y)= x-y+x+y=2x
б) (m+3)-(6m-5)= m+3-6m+5= -5m+8
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а) (x-y)+(x+y)= x-y+x+y=2x
б) (m+3)-(6m-5)= m+3-6m+5= -5m+8
б) -5m+8
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