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500+40d=200+60d
We move all terms to the left:
500+40d-(200+60d)=0
We add all the numbers together, and all the variables
40d-(60d+200)+500=0
We get rid of parentheses
40d-60d-200+500=0
We add all the numbers together, and all the variables
-20d+300=0
We move all terms containing d to the left, all other terms to the right
-20d=-300
d=-300/-20
d=+15
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