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-9d+4(d+12)=d-6
We move all terms to the left:
-9d+4(d+12)-(d-6)=0
We multiply parentheses
-9d+4d-(d-6)+48=0
We get rid of parentheses
-9d+4d-d+6+48=0
We add all the numbers together, and all the variables
-6d+54=0
We move all terms containing d to the left, all other terms to the right
-6d=-54
d=-54/-6
d=+9
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