3x+12+9x+13=121

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Solution for 3x+12+9x+13=121 equation: 



3x+12+9x+13=121

We move all terms to the left:

3x+12+9x+13-(121)=0

We add all the numbers together, and all the variables

12x-96=0

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

12x=96

x=96/12

x=8

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