30=12-2d

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Solution for 30=12-2d equation: 



30=12-2d

We move all terms to the left:

30-(12-2d)=0

We add all the numbers together, and all the variables

-(-2d+12)+30=0

We get rid of parentheses

2d-12+30=0

We add all the numbers together, and all the variables

2d+18=0

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

2d=-18

d=-18/2

d=-9

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