-8+20+10d=42

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Solution for -8+20+10d=42 equation: 



-8+20+10d=42

We move all terms to the left:

-8+20+10d-(42)=0

We add all the numbers together, and all the variables

10d-30=0

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

10d=30

d=30/10

d=3

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