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b) x-2xy+½x-⅛ xy=x+½x-2xy- ½xy= 1 ½x - 2 ⅛ xy
c)-x²+y²-2x²-2y²=-x²-2x²+y²-2y²=-3x²-y²
d) -x²+2x-3x+x²=-x²+x²+2x-3x=-x
e) 4x+4-7x-½=4x-7x+4-½=-3x+3½
f) -2ab+12a-4ab-16a=-2ab-4ab+12a-16a=-6ab-4a