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9+4d=-13+6d
We move all terms to the left:
9+4d-(-13+6d)=0
We add all the numbers together, and all the variables
4d-(6d-13)+9=0
We get rid of parentheses
4d-6d+13+9=0
We add all the numbers together, and all the variables
-2d+22=0
We move all terms containing d to the left, all other terms to the right
-2d=-22
d=-22/-2
d=+11
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