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-12=2d+3.2
We move all terms to the left:
-12-(2d+3.2)=0
We get rid of parentheses
-2d-3.2-12=0
We add all the numbers together, and all the variables
-2d-15.2=0
We move all terms containing d to the left, all other terms to the right
-2d=15.2
d=15.2/-2
d=-7+1/1.66666666667
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