math

18s^9 t^3 - 2s^9 t^2 = 9 can anyone explain pleases,thanks

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1. 18s^9 t^3 - 2s^9 t^2 can be factored into
2s^9 t^2 (9t-1)

No idea how that can be evaluated to 9. I suspect there is something missing or garbled in the problem statement as shown.

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posted by Steve

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