-63=-7(6+s)

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Solution for -63=-7(6+s) equation: 



-63=-7(6+s)

We move all terms to the left:

-63-(-7(6+s))=0

We add all the numbers together, and all the variables

-(-7(s+6))-63=0



We calculate terms in parentheses: -(-7(s+6)), so:

-7(s+6)

We multiply parentheses

-7s-42

Back to the equation:

-(-7s-42)



We get rid of parentheses

7s+42-63=0

We add all the numbers together, and all the variables

7s-21=0

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

7s=21

s=21/7

s=3

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