(-x+4y+) - (2x+7y-1) =............................
(3a - 2b +1) + (-2a-3b)=..........................
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(-x+4y)-(2x+7y-1) = -x+4y-2x-7y+1 = -3x+11y+1
(3a-2b+1)+(-2a-3b) = 3a-2b+1-2a-3b = 5a-b+1
(-x+4y)-(2x+7y-1)=-x+4y-2x-7y+1=-3x-3y+1
(3a-2b+1)+(-2a-3b)=3a-2b+1-2a-3b=a-5b+1