3+x=15+3x

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



3+x=15+3x

We move all terms to the left:

3+x-(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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