15=3-x+3x

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



15=3-x+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(2x+3)+15=0

We get rid of parentheses

-2x-3+15=0

We add all the numbers together, and all the variables

-2x+12=0

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

-2x=-12

x=-12/-2

x=+6

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