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# I have a few math problems that I'm unsure of how to solve. 9- 10n ,14 - 3n ,14 - 21n, (2-3n)*7, 7*2*(-3n).

I have a few math problems that I'm unsure of how to solve. 9- 10n ,14 - 3n ,14 - 21n, (2-3n)*7, 7*2*(-3n).