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0.12n+0.08(3000-n)=0.09(3000)
We move all terms to the left:
0.12n+0.08(3000-n)-(0.09(3000))=0
We add all the numbers together, and all the variables
0.12n+0.08(-1n+3000)-(0.093)=0
We add all the numbers together, and all the variables
0.12n+0.08(-1n+3000)-0.093=0
We multiply parentheses
0.12n-0.08n+240-0.093=0
We add all the numbers together, and all the variables
0.04n+239.907=0
We move all terms containing n to the left, all other terms to the right
0.04n=-239.907
n=-239.907/0.04
n=-5997+0.027000000000015/0.04
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