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-5+9d+2d=9+12d
We move all terms to the left:
-5+9d+2d-(9+12d)=0
We add all the numbers together, and all the variables
9d+2d-(12d+9)-5=0
We add all the numbers together, and all the variables
11d-(12d+9)-5=0
We get rid of parentheses
11d-12d-9-5=0
We add all the numbers together, and all the variables
-1d-14=0
We move all terms containing d to the left, all other terms to the right
-d=14
d=14/-1
d=-14
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