9x-129=4x+12

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Solution for 9x-129=4x+12 equation: 



9x-129=4x+12

We move all terms to the left:

9x-129-(4x+12)=0

We get rid of parentheses

9x-4x-12-129=0

We add all the numbers together, and all the variables

5x-141=0

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

5x=141

x=141/5

x=28+1/5

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