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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(-(x-12))-3=0



We calculate terms in parentheses: -(-(x-12)), so:

-(x-12)

We get rid of parentheses

-x+12

We add all the numbers together, and all the variables

-1x+12

Back to the equation:

-(-1x+12)



We get rid of parentheses

4x+1x-12-3=0

We add all the numbers together, and all the variables

5x-15=0

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

5x=15

x=15/5

x=3

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