how to simplify this formula? How do you simplify this equation to solve for RPM? 6.089/RPM + 1.98RPM = 14,918 It's part of my new formula for determining peak power RPM by transfer port duration and transfer/boost area. (on a 2 stroke engine) 
Multiply by rpm. You will get a quadratic equation. 
First, make it simple by multiplying each term by $1000$ $\dfrac{6089}{\text{RPM}}\;+\;1980\text{RPM}=14918 000$ Now, multiply each term by RPM $6089\;+\;1980\text{RPM}^2=14918\text{RPM}$ $1980\text{RPM}^214918\text{RPM}+6089=0$ We can observe that it's a quadratic equation So, solve it using quadratic formula, i.e., $x=\dfrac{b\pm\sqrt{b^24ac}}{2a}$ 
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6089/x + 1980x = 14918000 
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