d+d-39=129

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Solution for d+d-39=129 equation: 



d+d-39=129

We move all terms to the left:

d+d-39-(129)=0

We add all the numbers together, and all the variables

2d-168=0

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

2d=168

d=168/2

d=84

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