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(9d+2)(5)=
We move all terms to the left:
(9d+2)(5)-()=0
We add all the numbers together, and all the variables
(9d+2)5=0
We multiply parentheses
45d+10=0
We move all terms containing d to the left, all other terms to the right
45d=-10
d=-10/45
d=-2/9
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