6d+21=171

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Solution for 6d+21=171 equation: 



6d+21=171

We move all terms to the left:

6d+21-(171)=0

We add all the numbers together, and all the variables

6d-150=0

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

6d=150

d=150/6

d=25

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