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3.1-4.3d=-8.7
We move all terms to the left:
3.1-4.3d-(-8.7)=0
We add all the numbers together, and all the variables
-4.3d+11.8=0
We move all terms containing d to the left, all other terms to the right
-4.3d=-11.8
d=-11.8/-4.3
d=2+2.6666666666667/3.5833333333333
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