exam Maths Puzzle Numerical Ability

The amount of money A accrued at the end of N years when a certain amount P is invested at a compound annual rate r is given by A=P(1+r)^n IF a person invests $120 at 6% interest

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Please help with this equation,

x/2-x/6=2

Thank you what is the simplified answer to (a^n-1*b^-2n)/ (a^n+1*b^2n-2). The directions say "assume that no denominator equals 0 and that m and n are integers greater than 1."