x-3x=15-x

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



x-3x=15-x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-2x-(-1x+15)=0

We get rid of parentheses

-2x+1x-15=0

We add all the numbers together, and all the variables

-1x-15=0

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

-x=15

x=15/-1

x=-15

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