book Maths Puzzle Numerical Ability

If the average arithmetic mean of 8, 12, 15, 21, x and 11 is 17 then what is x?

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i am having problem with functions, like input and output problem can you keep.
please help A.S.A.P Determine the equation of a line parallel to 2x - 5y = 4 and passes through (4,0).