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6+13.89d=10+12.89d
We move all terms to the left:
6+13.89d-(10+12.89d)=0
We add all the numbers together, and all the variables
13.89d-(12.89d+10)+6=0
We get rid of parentheses
13.89d-12.89d-10+6=0
We add all the numbers together, and all the variables
d-4=0
We move all terms containing d to the left, all other terms to the right
d=4
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