15=-3(k-1)+9

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Solution for 15=-3(k-1)+9 equation: 



15=-3(k-1)+9

We move all terms to the left:

15-(-3(k-1)+9)=0



We calculate terms in parentheses: -(-3(k-1)+9), so:

-3(k-1)+9

We multiply parentheses

-3k+3+9

We add all the numbers together, and all the variables

-3k+12

Back to the equation:

-(-3k+12)



We get rid of parentheses

3k-12+15=0

We add all the numbers together, and all the variables

3k+3=0

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

3k=-3

k=-3/3

k=-1

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