42=-7(n-3)

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



42=-7(n-3)

We move all terms to the left:

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



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

-7(n-3)

We multiply parentheses

-7n+21

Back to the equation:

-(-7n+21)



We get rid of parentheses

7n-21+42=0

We add all the numbers together, and all the variables

7n+21=0

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

7n=-21

n=-21/7

n=-3

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