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d+30=1.8d
We move all terms to the left:
d+30-(1.8d)=0
We add all the numbers together, and all the variables
d-(+1.8d)+30=0
We get rid of parentheses
d-1.8d+30=0
We add all the numbers together, and all the variables
-0.8d+30=0
We move all terms containing d to the left, all other terms to the right
-0.8d=-30
d=-30/-0.8
d=37+0.4/0.8
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