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-15d+16+19d=20+19d
We move all terms to the left:
-15d+16+19d-(20+19d)=0
We add all the numbers together, and all the variables
-15d+19d-(19d+20)+16=0
We add all the numbers together, and all the variables
4d-(19d+20)+16=0
We get rid of parentheses
4d-19d-20+16=0
We add all the numbers together, and all the variables
-15d-4=0
We move all terms containing d to the left, all other terms to the right
-15d=4
d=4/-15
d=-4/15
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