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-12.98+4d=5.9d+1.46
We move all terms to the left:
-12.98+4d-(5.9d+1.46)=0
We get rid of parentheses
4d-5.9d-1.46-12.98=0
We add all the numbers together, and all the variables
-1.9d-14.44=0
We move all terms containing d to the left, all other terms to the right
-1.9d=14.44
d=14.44/-1.9
d=-7+1/1.66666666667
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