3x+9x=15-3

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



3x+9x=15-3

We move all terms to the left:

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

We add all the numbers together, and all the variables

3x+9x-12=0

We add all the numbers together, and all the variables

12x-12=0

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

12x=12

x=12/12

x=1

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