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

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



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

We move all terms to the left:

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



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

7x+3(x+3)

We multiply parentheses

7x+3x+9

We add all the numbers together, and all the variables

10x+9

Back to the equation:

-(10x+9)



We get rid of parentheses

-10x-9-31=0

We add all the numbers together, and all the variables

-10x-40=0

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

-10x=40

x=40/-10

x=-4

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