3x+15+9x=123

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Solution for 3x+15+9x=123 equation: 



3x+15+9x=123

We move all terms to the left:

3x+15+9x-(123)=0

We add all the numbers together, and all the variables

12x-108=0

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

12x=108

x=108/12

x=9

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