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3x-7x+6 + 6x-2x+6x
6x+6
b)r(x) - q(x):
-2x+4x-1 - (6x-2x+6x)
2x-1-6x+2x-6x
-8x-1
c) p(x)-q(x)+r(x):
3x-7x+6 -(6x-2x+6x)+ (-2x+4x-1)
-4x+6-6x+2x-6x-2x+4x-1
-12x+5