5x+12+4x=129

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Solution for 5x+12+4x=129 equation: 



5x+12+4x=129

We move all terms to the left:

5x+12+4x-(129)=0

We add all the numbers together, and all the variables

9x-117=0

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

9x=117

x=117/9

x=13

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