-6x+21=-9(x-1)

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Solution for -6x+21=-9(x-1) equation: 



-6x+21=-9(x-1)

We move all terms to the left:

-6x+21-(-9(x-1))=0



We calculate terms in parentheses: -(-9(x-1)), so:

-9(x-1)

We multiply parentheses

-9x+9

Back to the equation:

-(-9x+9)



We get rid of parentheses

-6x+9x-9+21=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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