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2x^2+4x+2 + 2x^2-3x-20
4x^2 + x - 18
=2x²+4x+2 + (2x²-3x-20)
=2x²+4x+2+2x²-3x-20
=2x²+2x²+4x-3x+2-20
=4x²+x-18
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