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b)1½x-2½xy
c)-3x²-y²
d)-x
e)-3x+3½
f)-6ab-4a
b. x-2xy+½x- ⅓xy = 1½x - 2⅔xy
c. -x²+y²-2x²-2y² = -3x² -y²
d. -x²+2x-3x+x² = -x
e. 4x+4-7x-½ = 3½ - 2x
f. -2ab+12a-4ab-16a = -6ab - 4a