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5x^2(3+x)=2x-1
We move all terms to the left:
5x^2(3+x)-(2x-1)=0
We add all the numbers together, and all the variables
5x^2(x+3)-(2x-1)=0
We get rid of parentheses
5x^2(x+3)-2x+1=0
We move all terms containing x to the left, all other terms to the right
5x^2(x+3)-2x=-1
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