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11.97-6.5d=-7.2
We move all terms to the left:
11.97-6.5d-(-7.2)=0
We add all the numbers together, and all the variables
-6.5d+19.17=0
We move all terms containing d to the left, all other terms to the right
-6.5d=-19.17
d=-19.17/-6.5
d=2+1/1.05348460292
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