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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

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



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

(x+9)

We get rid of parentheses

x+9

Back to the equation:

-(x+9)



We get rid of parentheses

3x-x-9-12=0

We add all the numbers together, and all the variables

2x-21=0

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

2x=21

x=21/2

x=10+1/2

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