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89d-875=2100-86d
We move all terms to the left:
89d-875-(2100-86d)=0
We add all the numbers together, and all the variables
89d-(-86d+2100)-875=0
We get rid of parentheses
89d+86d-2100-875=0
We add all the numbers together, and all the variables
175d-2975=0
We move all terms containing d to the left, all other terms to the right
175d=2975
d=2975/175
d=17
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