If you call one n (as you did), the other is 2n-3000. The sum of the two is 91500. Thus
2n+n-3000=91500. Combine the terms with n to get 3n, Add 3000 to both sides (members) of the equation. Finally
3n=91500+3000=94500 . Divide both members by 3 to get
n=94500/3=31500
The other is 2n-3000=2(31500)-3000=60000.
Some calculators have a solver that you can use
to solve linear and nonlinear equations, However, since you no not
disclose the brand or model number, nobody will be able to tell you how
to set it up. Sorry.
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