-3x+6+7=-8

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Solution for -3x+6+7=-8 equation: 



-3x+6+7=-8

We move all terms to the left:

-3x+6+7-(-8)=0

We add all the numbers together, and all the variables

-3x+21=0

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

-3x=-21

x=-21/-3

x=+7

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