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0.1d+0.5=0.15d
We move all terms to the left:
0.1d+0.5-(0.15d)=0
We add all the numbers together, and all the variables
0.1d-(+0.15d)+0.5=0
We get rid of parentheses
0.1d-0.15d+0.5=0
We add all the numbers together, and all the variables
-0.05d+0.5=0
We move all terms containing d to the left, all other terms to the right
-0.05d=-0.5
d=-0.5/-0.05
d=+10
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