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7+1.50d=29.50
We move all terms to the left:
7+1.50d-(29.50)=0
We add all the numbers together, and all the variables
1.50d+7-(29.5)=0
We add all the numbers together, and all the variables
1.50d-22.5=0
We move all terms containing d to the left, all other terms to the right
1.50d=22.5
d=22.5/1.50
d=15
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