a) -4x-7-3x+7 = -7x
b)x-2xy+o,5x-0,75xy = 1,5x - 1,25xy
c)-x^2+y^2-2x^2-2y^2 = -3x^2 + y^2
d)-x^2+2x-3x+x^2 = -x
e)4x+4-7x-o,5 = -3x + 3,5
f)-2ab+12a-4ab-16a = -6ab - 4a
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a) -4x-7-3x+7 = -7x
b)x-2xy+o,5x-0,75xy = 1,5x - 1,25xy
c)-x^2+y^2-2x^2-2y^2 = -3x^2 + y^2
d)-x^2+2x-3x+x^2 = -x
e)4x+4-7x-o,5 = -3x + 3,5
f)-2ab+12a-4ab-16a = -6ab - 4a