x^3+5x^2+7x+3=x^3+4x+3
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x^3+5x^2+7x+3=x^3+4x+3
5x^2+3x=0
x(5x+3)=0
x=0 or 5x+3=0
x=0 & 5x=-3
x=0 & x= -3/5
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