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4a-2a-3b-5b+5+6
2a-8b+11
b)2x-3y-1-(x+2y-4)
2x-x-3y-2y-1+4
x-5y+3
c)-5x+2y+3-(2x-4y+4)
-5x-2x+2y+4y+3-4
-7x+6y-1