exam Maths Puzzle Numerical Ability

9/11-3/11+7/11=??

Help again please, I never understood the fraction stuff and still dont. I always forget which goes with what. Can someone help me please?

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exam Other Question
Please help me on what is the difference between the below formulas:

y1 - y2/x1 - x2 and y2 - y1/ x2 - x1

Ex. (4,9), (3,6) m = 5/2 H(x)= the square root of x-4