15=-3(x-1)=9

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



15=-3(x-1)=9

We move all terms to the left:

15-(-3(x-1))=0



We calculate terms in parentheses: -(-3(x-1)), so:

-3(x-1)

We multiply parentheses

-3x+3

Back to the equation:

-(-3x+3)



We get rid of parentheses

3x-3+15=0

We add all the numbers together, and all the variables

3x+12=0

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

3x=-12

x=-12/3

x=-4

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