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-18=12-6d
We move all terms to the left:
-18-(12-6d)=0
We add all the numbers together, and all the variables
-(-6d+12)-18=0
We get rid of parentheses
6d-12-18=0
We add all the numbers together, and all the variables
6d-30=0
We move all terms containing d to the left, all other terms to the right
6d=30
d=30/6
d=5
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