exam Maths Puzzle Numerical Ability

f1(x) =1/2x + 5

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exam Other Question

Another problem I'm having troubles with is:
perform the indicated operation and simplify:

1- 2x-1 over x^2-4 over or divided by 1+ 1/x-2

Translation:
1- 2x-1 divided by x
hey
I need to find Greatest Common Factor(GCF)
6a^2b^2 + 18ab^3