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10d+20+20=-20+15d
We move all terms to the left:
10d+20+20-(-20+15d)=0
We add all the numbers together, and all the variables
10d-(15d-20)+20+20=0
We add all the numbers together, and all the variables
10d-(15d-20)+40=0
We get rid of parentheses
10d-15d+20+40=0
We add all the numbers together, and all the variables
-5d+60=0
We move all terms containing d to the left, all other terms to the right
-5d=-60
d=-60/-5
d=+12
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