find the sum of 5x³-x²+x-1;2x²-2x+5;-5x+5x-4 ex
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= 5x³-x²+x-1+2x²-2x+5+(-5x+5x-4)
= 5x³-x²+x-1+2x²-2x+5-5x+5x-4
= 5x³-x²+2x²+x-2x-5x+5x-1+5-4
= 5x³+x²-x
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