three sides of a triangle are 5-3x+7x^2, 2x^2+3x-2 and 3x^2-x+3 find the perimeter.
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(2x^2+3x-2)+3x^2-x+3=5x^2+2x+1
5-3x+7x^2-(5x^2+2x+1)
=4-5x+2x^2 is the third side
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