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30=12d-6
We move all terms to the left:
30-(12d-6)=0
We get rid of parentheses
-12d+6+30=0
We add all the numbers together, and all the variables
-12d+36=0
We move all terms containing d to the left, all other terms to the right
-12d=-36
d=-36/-12
d=+3
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