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-5.5d-2=-12.1
We move all terms to the left:
-5.5d-2-(-12.1)=0
We add all the numbers together, and all the variables
-5.5d+10.1=0
We move all terms containing d to the left, all other terms to the right
-5.5d=-10.1
d=-10.1/-5.5
d=1+2.875/3.4375
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