9x-21=-3(x-5)

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Solution for 9x-21=-3(x-5) equation: 



9x-21=-3(x-5)

We move all terms to the left:

9x-21-(-3(x-5))=0



We calculate terms in parentheses: -(-3(x-5)), so:

-3(x-5)

We multiply parentheses

-3x+15

Back to the equation:

-(-3x+15)



We get rid of parentheses

9x+3x-15-21=0

We add all the numbers together, and all the variables

12x-36=0

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

12x=36

x=36/12

x=3

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