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18+3d=12+4d
We move all terms to the left:
18+3d-(12+4d)=0
We add all the numbers together, and all the variables
3d-(4d+12)+18=0
We get rid of parentheses
3d-4d-12+18=0
We add all the numbers together, and all the variables
-1d+6=0
We move all terms containing d to the left, all other terms to the right
-d=-6
d=-6/-1
d=+6
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