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3+4+5(2d-3)=7.5
We move all terms to the left:
3+4+5(2d-3)-(7.5)=0
We add all the numbers together, and all the variables
5(2d-3)-0.5=0
We multiply parentheses
10d-15-0.5=0
We add all the numbers together, and all the variables
10d-15.5=0
We move all terms containing d to the left, all other terms to the right
10d=15.5
d=15.5/10
d=1+1/1.8181818181818
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