42=-7(s-3)

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Solution for 42=-7(s-3) equation: 



42=-7(s-3)

We move all terms to the left:

42-(-7(s-3))=0



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

-7(s-3)

We multiply parentheses

-7s+21

Back to the equation:

-(-7s+21)



We get rid of parentheses

7s-21+42=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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