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4d+9-13d=-11d-9
We move all terms to the left:
4d+9-13d-(-11d-9)=0
We add all the numbers together, and all the variables
-9d-(-11d-9)+9=0
We get rid of parentheses
-9d+11d+9+9=0
We add all the numbers together, and all the variables
2d+18=0
We move all terms containing d to the left, all other terms to the right
2d=-18
d=-18/2
d=-9
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