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-5.1-d=6.5
We move all terms to the left:
-5.1-d-(6.5)=0
We add all the numbers together, and all the variables
-1d-11.6=0
We move all terms containing d to the left, all other terms to the right
-d=11.6
d=11.6/-1
d=-11+0.6/1
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