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12.81+16.4d-16.61=16.84+18d
We move all terms to the left:
12.81+16.4d-16.61-(16.84+18d)=0
We add all the numbers together, and all the variables
16.4d-(18d+16.84)+12.81-16.61=0
We add all the numbers together, and all the variables
16.4d-(18d+16.84)-3.8=0
We get rid of parentheses
16.4d-18d-16.84-3.8=0
We add all the numbers together, and all the variables
-1.6d-20.64=0
We move all terms containing d to the left, all other terms to the right
-1.6d=20.64
d=20.64/-1.6
d=-12+1/1.11111111111
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