exam Maths Puzzle Numerical Ability

If one-half thenumber is subtracted from five-sixths of the number,the difference is 6. Find the number

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exam Other Question

I am stuck on correct answer for:

If x = 3 and y = -2, then 7x - 3y over 2x + y =

I believe answer is 27 over 4 but I need to verify my work. Can you show me the breakdown to get correct resolve? How do I find the slope of the line passing through points (3,4) and (3,-4)? My solution is 0..am I right?