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-12d-18=4-16-14d
We move all terms to the left:
-12d-18-(4-16-14d)=0
We add all the numbers together, and all the variables
-12d-(-14d-12)-18=0
We get rid of parentheses
-12d+14d+12-18=0
We add all the numbers together, and all the variables
2d-6=0
We move all terms containing d to the left, all other terms to the right
2d=6
d=6/2
d=3
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