x+12=3-x

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Solution for x+12=3-x equation: 



x+12=3-x

We move all terms to the left:

x+12-(3-x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+1x-3+12=0

We add all the numbers together, and all the variables

2x+9=0

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

2x=-9

x=-9/2

x=-4+1/2

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