-42=-7(s-90)

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Solution for -42=-7(s-90) equation: 



-42=-7(s-90)

We move all terms to the left:

-42-(-7(s-90))=0



We calculate terms in parentheses: -(-7(s-90)), so:

-7(s-90)

We multiply parentheses

-7s+630

Back to the equation:

-(-7s+630)



We get rid of parentheses

7s-630-42=0

We add all the numbers together, and all the variables

7s-672=0

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

7s=672

s=672/7

s=96

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