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*12=4000-3000D-0.06*12
We move all terms to the left:
*12-(4000-3000D-0.06*12)=0
We add all the numbers together, and all the variables
-(-3000D+3999.28)+*12=0
We add all the numbers together, and all the variables
-(-3000D+3999.28)=0
We get rid of parentheses
3000D-3999.28=0
We move all terms containing D to the left, all other terms to the right
3000D=3999.28
D=3999.28/3000
D=1+304.65853658535/914.63414634141
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