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3(4d+3)=51
We move all terms to the left:
3(4d+3)-(51)=0
We multiply parentheses
12d+9-51=0
We add all the numbers together, and all the variables
12d-42=0
We move all terms containing d to the left, all other terms to the right
12d=42
d=42/12
d=3+1/2
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