3x+9x+12=72

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Solution for 3x+9x+12=72 equation: 



3x+9x+12=72

We move all terms to the left:

3x+9x+12-(72)=0

We add all the numbers together, and all the variables

12x-60=0

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

12x=60

x=60/12

x=5

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