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-15.13-13.2d=-11.5d
We move all terms to the left:
-15.13-13.2d-(-11.5d)=0
We get rid of parentheses
-13.2d+11.5d-15.13=0
We add all the numbers together, and all the variables
-1.7d-15.13=0
We move all terms containing d to the left, all other terms to the right
-1.7d=15.13
d=15.13/-1.7
d=-8+1/1.11111111111
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