X+3=15+3x

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



X+3=15+3X

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

X-3X-15+3=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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