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3d+2(d-5)=25
We move all terms to the left:
3d+2(d-5)-(25)=0
We multiply parentheses
3d+2d-10-25=0
We add all the numbers together, and all the variables
5d-35=0
We move all terms containing d to the left, all other terms to the right
5d=35
d=35/5
d=7
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