-5x+21+7x+21=-12

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Solution for -5x+21+7x+21=-12 equation: 



-5x+21+7x+21=-12

We move all terms to the left:

-5x+21+7x+21-(-12)=0

We add all the numbers together, and all the variables

2x+54=0

We move all terms containing x to the left, all other terms to the right

2x=-54

x=-54/2

x=-27

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