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4(2d-5)+7d=0
We add all the numbers together, and all the variables
7d+4(2d-5)=0
We multiply parentheses
7d+8d-20=0
We add all the numbers together, and all the variables
15d-20=0
We move all terms containing d to the left, all other terms to the right
15d=20
d=20/15
d=1+1/3
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