exam Maths Puzzle Numerical Ability

can someone help me to perform operation and simplify if possible I also need to know how to set it up
6/x+5 - 4/x-5

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exam Other Question

M=2=2/1 A lift can carry 6 more people than a lift B.
a): by letting the number of people that B can carry be x state the number of people that A can Carry
B): When B makes 5 journeys it