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1.4d-8=d+12
We move all terms to the left:
1.4d-8-(d+12)=0
We get rid of parentheses
1.4d-d-12-8=0
We add all the numbers together, and all the variables
0.4d-20=0
We move all terms containing d to the left, all other terms to the right
0.4d=20
d=20/0.4
d=50
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