45=-3(k-7)

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Solution for 45=-3(k-7) equation: 



45=-3(k-7)

We move all terms to the left:

45-(-3(k-7))=0



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

-3(k-7)

We multiply parentheses

-3k+21

Back to the equation:

-(-3k+21)



We get rid of parentheses

3k-21+45=0

We add all the numbers together, and all the variables

3k+24=0

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

3k=-24

k=-24/3

k=-8

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