30=7+12d

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Solution for 30=7+12d equation: 



30=7+12d

We move all terms to the left:

30-(7+12d)=0

We add all the numbers together, and all the variables

-(12d+7)+30=0

We get rid of parentheses

-12d-7+30=0

We add all the numbers together, and all the variables

-12d+23=0

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

-12d=-23

d=-23/-12

d=1+11/12

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