x+x+39=129

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Solution for x+x+39=129 equation: 



x+x+39=129

We move all terms to the left:

x+x+39-(129)=0

We add all the numbers together, and all the variables

2x-90=0

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

2x=90

x=90/2

x=45

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