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0.12n+0.05(2100-n)=0.07(2100)
We move all terms to the left:
0.12n+0.05(2100-n)-(0.07(2100))=0
We add all the numbers together, and all the variables
0.12n+0.05(-1n+2100)-(0.0721)=0
We add all the numbers together, and all the variables
0.12n+0.05(-1n+2100)-0.0721=0
We multiply parentheses
0.12n-0.05n+105-0.0721=0
We add all the numbers together, and all the variables
0.07n+104.9279=0
We move all terms containing n to the left, all other terms to the right
0.07n=-104.9279
n=-104.9279/0.07
n=-1498+0.0679/0.07
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