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(7d+23)+6d+139+5d=360
We move all terms to the left:
(7d+23)+6d+139+5d-(360)=0
We add all the numbers together, and all the variables
11d+(7d+23)-221=0
We get rid of parentheses
11d+7d+23-221=0
We add all the numbers together, and all the variables
18d-198=0
We move all terms containing d to the left, all other terms to the right
18d=198
d=198/18
d=11
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