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4d+0.18+1.6d=8.1d+1.35
We move all terms to the left:
4d+0.18+1.6d-(8.1d+1.35)=0
We add all the numbers together, and all the variables
5.6d-(8.1d+1.35)+0.18=0
We get rid of parentheses
5.6d-8.1d-1.35+0.18=0
We add all the numbers together, and all the variables
-2.5d-1.17=0
We move all terms containing d to the left, all other terms to the right
-2.5d=1.17
d=1.17/-2.5
d=-1/2.1367521367521
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