x+x+15+x-12=129

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Solution for x+x+15+x-12=129 equation: 



x+x+15+x-12=129

We move all terms to the left:

x+x+15+x-12-(129)=0

We add all the numbers together, and all the variables

3x-126=0

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

3x=126

x=126/3

x=42

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