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d/5-78=9
We move all terms to the left:
d/5-78-(9)=0
We add all the numbers together, and all the variables
d/5-87=0
We multiply all the terms by the denominator
d-87*5=0
We add all the numbers together, and all the variables
d-435=0
We move all terms containing d to the left, all other terms to the right
d=435
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