x+15=7+3x

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Solution for x+15=7+3x equation: 



x+15=7+3x

We move all terms to the left:

x+15-(7+3x)=0

We add all the numbers together, and all the variables

x-(3x+7)+15=0

We get rid of parentheses

x-3x-7+15=0

We add all the numbers together, and all the variables

-2x+8=0

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

-2x=-8

x=-8/-2

x=+4

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