x+12-3x=3+x

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



x+12-3x=3+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-2x-(x+3)+12=0

We get rid of parentheses

-2x-x-3+12=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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