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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(5x+7(-1x-3))-7=0



We calculate terms in parentheses: -(5x+7(-1x-3)), so:

5x+7(-1x-3)

We multiply parentheses

5x-7x-21

We add all the numbers together, and all the variables

-2x-21

Back to the equation:

-(-2x-21)



We get rid of parentheses

2x+21-7=0

We add all the numbers together, and all the variables

2x+14=0

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

2x=-14

x=-14/2

x=-7

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