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b) 1½x - 2⅓xy
c) -3x² - y²
d) -x
e) -3x + 3½
f) -6ab -4a
b) x-2xy+½x-⅓xy=1¹/₂x-1¹/₂xy
c) -x²+y²-2x²-2y²=-3x²-y²
d) -x²+2x-3x+x²=-x
e) 4x+4-7x-½=-3x+3¹/₂
f) -2ab+12a-4ab-16a=-6ab+4a
b)½x²
c)-3x²-y²
d)x²
e)-3+2
f)-6ab-4a