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.25(d-12)=12
We move all terms to the left:
.25(d-12)-(12)=0
We multiply parentheses
0.25d-3-12=0
We add all the numbers together, and all the variables
0.25d-15=0
We move all terms containing d to the left, all other terms to the right
0.25d=15
d=15/0.25
d=60
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