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9(1+d)=72
We move all terms to the left:
9(1+d)-(72)=0
We add all the numbers together, and all the variables
9(d+1)-72=0
We multiply parentheses
9d+9-72=0
We add all the numbers together, and all the variables
9d-63=0
We move all terms containing d to the left, all other terms to the right
9d=63
d=63/9
d=7
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