a) -4x-7-3x+7= - 7x
b)x-2xy+1/2x-1/3xy= 1 1/2x - 2 1/3xy
c)-x²+y²-2x²-2y² = - 3x² - y²
d)-x²+2x-3x+x²= - x
e)4x+4-7x-1/2 = - 3x + 3 1/2
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a) -4x-7-3x+7= - 7x
b)x-2xy+1/2x-1/3xy= 1 1/2x - 2 1/3xy
c)-x²+y²-2x²-2y² = - 3x² - y²
d)-x²+2x-3x+x²= - x
e)4x+4-7x-1/2 = - 3x + 3 1/2