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-1.8=0.5d=0.4d
We move all terms to the left:
-1.8-(0.5d)=0
We add all the numbers together, and all the variables
-(+0.5d)-1.8=0
We get rid of parentheses
-0.5d-1.8=0
We move all terms containing d to the left, all other terms to the right
-0.5d=1.8
d=1.8/-0.5
d=-3+0.3/0.5
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