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-3x³+2x²+5x-1+2x²+3x=
-3x³+4x²+8x
b) G(x) - W(x)
x⁴-2x³+4x²-7-(-3x³+2x²+5x-1)=
x⁴-2x³+4x²-7+3x³-2x²-5x+1=
x⁴+x³+2x²-5x-6
c) 3 - P(x) - 2 * W(x)
3-(2x²+3x)-2(-3x³+2x²+5x-1)=
3-2x²-3x+6x³-4x²-10x+2=
6x³-6x²-13x+5