15=x-1+3x

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Solution for 15=x-1+3x equation: 



15=x-1+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(4x-1)+15=0

We get rid of parentheses

-4x+1+15=0

We add all the numbers together, and all the variables

-4x+16=0

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

-4x=-16

x=-16/-4

x=+4

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