3x+6=x+15

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Solution for 3x+6=x+15 equation: 



3x+6=x+15

We move all terms to the left:

3x+6-(x+15)=0

We get rid of parentheses

3x-x-15+6=0

We add all the numbers together, and all the variables

2x-9=0

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

2x=9

x=9/2

x=4+1/2

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