d+18=-12-2d

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Solution for d+18=-12-2d equation: 



d+18=-12-2d

We move all terms to the left:

d+18-(-12-2d)=0

We add all the numbers together, and all the variables

d-(-2d-12)+18=0

We get rid of parentheses

d+2d+12+18=0

We add all the numbers together, and all the variables

3d+30=0

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

3d=-30

d=-30/3

d=-10

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