x(x-3+x(7-x)=-7

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Solution for x(x-3+x(7-x)=-7 equation: 



x(x-3+x(7-x)=-7

We move all terms to the left:

x(x-3+x(7-x)-(-7)=0

We add all the numbers together, and all the variables

x(x-3+x(-1x+7)-(-7)=0

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