30=d*2

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Solution for 30=d*2 equation: 



30=d*2

We move all terms to the left:

30-(d*2)=0

We add all the numbers together, and all the variables

-(+d*2)+30=0

We get rid of parentheses

-d*2+30=0

Wy multiply elements

-2d+30=0

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

-2d=-30

d=-30/-2

d=+15

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