12+3x=3-x

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



12+3x=3-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x-(-1x+3)+12=0

We get rid of parentheses

3x+1x-3+12=0

We add all the numbers together, and all the variables

4x+9=0

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

4x=-9

x=-9/4

x=-2+1/4

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