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5(2d-7)=55
We move all terms to the left:
5(2d-7)-(55)=0
We multiply parentheses
10d-35-55=0
We add all the numbers together, and all the variables
10d-90=0
We move all terms containing d to the left, all other terms to the right
10d=90
d=90/10
d=9
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