-3=5x+7(x+3)

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Solution for -3=5x+7(x+3) equation: 



-3=5x+7(x+3)

We move all terms to the left:

-3-(5x+7(x+3))=0



We calculate terms in parentheses: -(5x+7(x+3)), so:

5x+7(x+3)

We multiply parentheses

5x+7x+21

We add all the numbers together, and all the variables

12x+21

Back to the equation:

-(12x+21)



We get rid of parentheses

-12x-21-3=0

We add all the numbers together, and all the variables

-12x-24=0

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

-12x=24

x=24/-12

x=-2

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