7d-10=-3d-20

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Solution for 7d-10=-3d-20 equation: 



7d-10=-3d-20

We move all terms to the left:

7d-10-(-3d-20)=0

We get rid of parentheses

7d+3d+20-10=0

We add all the numbers together, and all the variables

10d+10=0

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

10d=-10

d=-10/10

d=-1

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