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0.1d+0.18=0.12d-0.2
We move all terms to the left:
0.1d+0.18-(0.12d-0.2)=0
We get rid of parentheses
0.1d-0.12d+0.2+0.18=0
We add all the numbers together, and all the variables
-0.02d+0.38=0
We move all terms containing d to the left, all other terms to the right
-0.02d=-0.38
d=-0.38/-0.02
d=+19
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