12-x=15+3x

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Solution for 12-x=15+3x equation: 



12-x=15+3x

We move all terms to the left:

12-x-(15+3x)=0

We add all the numbers together, and all the variables

-x-(3x+15)+12=0

We add all the numbers together, and all the variables

-1x-(3x+15)+12=0

We get rid of parentheses

-1x-3x-15+12=0

We add all the numbers together, and all the variables

-4x-3=0

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

-4x=3

x=3/-4

x=-3/4

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