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2x(-3x+7)=-6x^2-14x
We move all terms to the left:
2x(-3x+7)-(-6x^2-14x)=0
We multiply parentheses
-(-6x^2-14x)-6x^2+14x=0
We get rid of parentheses
6x^2-6x^2+14x+14x=0
We add all the numbers together, and all the variables
28x=0
x=0/28
x=0
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