-31=-2x-3(7+x)

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Solution for -31=-2x-3(7+x) equation: 



-31=-2x-3(7+x)

We move all terms to the left:

-31-(-2x-3(7+x))=0

We add all the numbers together, and all the variables

-(-2x-3(x+7))-31=0



We calculate terms in parentheses: -(-2x-3(x+7)), so:

-2x-3(x+7)

We multiply parentheses

-2x-3x-21

We add all the numbers together, and all the variables

-5x-21

Back to the equation:

-(-5x-21)



We get rid of parentheses

5x+21-31=0

We add all the numbers together, and all the variables

5x-10=0

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

5x=10

x=10/5

x=2

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