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18.86-5.72+11.5d=-6.7+9.9d
We move all terms to the left:
18.86-5.72+11.5d-(-6.7+9.9d)=0
We add all the numbers together, and all the variables
11.5d-(9.9d-6.7)+18.86-5.72=0
We add all the numbers together, and all the variables
11.5d-(9.9d-6.7)+13.14=0
We get rid of parentheses
11.5d-9.9d+6.7+13.14=0
We add all the numbers together, and all the variables
1.6d+19.84=0
We move all terms containing d to the left, all other terms to the right
1.6d=-19.84
d=-19.84/1.6
d=-12+0.64/1.6
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