20+10d=-30

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Solution for 20+10d=-30 equation: 



20+10d=-30

We move all terms to the left:

20+10d-(-30)=0

We add all the numbers together, and all the variables

10d+50=0

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

10d=-50

d=-50/10

d=-5

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