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2.09+1.5d=6.65-0.9d+8.1d
We move all terms to the left:
2.09+1.5d-(6.65-0.9d+8.1d)=0
We add all the numbers together, and all the variables
1.5d-(7.2d+6.65)+2.09=0
We get rid of parentheses
1.5d-7.2d-6.65+2.09=0
We add all the numbers together, and all the variables
-5.7d-4.56=0
We move all terms containing d to the left, all other terms to the right
-5.7d=4.56
d=4.56/-5.7
d=-2.9230769230769/3.6538461538462
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