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160+20d=55+15d
We move all terms to the left:
160+20d-(55+15d)=0
We add all the numbers together, and all the variables
20d-(15d+55)+160=0
We get rid of parentheses
20d-15d-55+160=0
We add all the numbers together, and all the variables
5d+105=0
We move all terms containing d to the left, all other terms to the right
5d=-105
d=-105/5
d=-21
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