3x-21=-9(x+1)

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Solution for 3x-21=-9(x+1) equation: 



3x-21=-9(x+1)

We move all terms to the left:

3x-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

3x+9x+9-21=0

We add all the numbers together, and all the variables

12x-12=0

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

12x=12

x=12/12

x=1

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