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2x-1)(x+3)=(x+7)(3-4x)
We move all terms to the left:
2x-1)(x+3)-((x+7)(3-4x))=0
We add all the numbers together, and all the variables
2x-1)(x+3)-((x+7)(-4x+3))=0
We multiply parentheses ..
3)-((-4x^2+3x-28x+21))+2x-1)(x=0
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