12+9=-3(x-7)

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Solution for 12+9=-3(x-7) equation: 



12+9=-3(x-7)

We move all terms to the left:

12+9-(-3(x-7))=0

We add all the numbers together, and all the variables

-(-3(x-7))+21=0



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

-3(x-7)

We multiply parentheses

-3x+21

Back to the equation:

-(-3x+21)



We get rid of parentheses

3x-21+21=0

We add all the numbers together, and all the variables

3x=0

x=0/3

x=0

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