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6.5(2d-3)+d=8.5
We move all terms to the left:
6.5(2d-3)+d-(8.5)=0
We add all the numbers together, and all the variables
d+6.5(2d-3)-8.5=0
We multiply parentheses
d+13d-19.5-8.5=0
We add all the numbers together, and all the variables
14d-28=0
We move all terms containing d to the left, all other terms to the right
14d=28
d=28/14
d=2
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