42=-7(y-3)

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



42=-7(y-3)

We move all terms to the left:

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



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

-7(y-3)

We multiply parentheses

-7y+21

Back to the equation:

-(-7y+21)



We get rid of parentheses

7y-21+42=0

We add all the numbers together, and all the variables

7y+21=0

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

7y=-21

y=-21/7

y=-3

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