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-9d=-4-8
We move all terms to the left:
-9d-(-4-8)=0
We add all the numbers together, and all the variables
-9d-(-12)=0
We add all the numbers together, and all the variables
-9d+12=0
We move all terms containing d to the left, all other terms to the right
-9d=-12
d=-12/-9
d=1+1/3
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