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I'm having a bit of trouble here 500 000 x 1.004375^n -[10 000 (1.004375^n -1)]/ 0.004375 How do I isolate and find n?

Hi, first post. I recall my teacher saying after a certain year that the syllabus got a lot of content rid of, so how far back should I go in practising past hsc questions? I also have my hands on Success One and Chemistry Dot Point and then can get sample answers off past hsc exams (only 2012...