exam Maths Puzzle Numerical Ability

I am trying to find the correct process to work this problem out. One that shows step by step and how each step was retrieved.

6x -1 / 5 - 2x/3 = 3

/ means divide.

Thanks
Kathy

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Find the exact length of the altitude to the hypotenuse of a right triangle with legs 10 and {{{8sqrt(3)}}}. If you can cut the lawn in 2 hours, and your spouse can do it in 3 hours, how long would it take if you work together? What assumptions (if any) did you make to arrive at your solution?