exam Maths Puzzle Numerical Ability

simplify
a)
5
____
12xy

+
3
_
4x

b)
r
__
r-5

-

5
_
r-5

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Edwin
my appologies I made a mistake
P = 4I - 100 (not plus as I put in the question)
sorry (1 + i)^n + (1 - i)^n