12+7x-21=-8(3-x+4x

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Solution for 12+7x-21=-8(3-x+4x equation: 



12+7x-21=-8(3-x+4x

We move all terms to the left:

12+7x-21-(-8(3-x+4x)=0

We add all the numbers together, and all the variables

7x-(-8(3x+3)+12-21=0

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