exam Maths Puzzle Numerical Ability

I was supposed to subtract and express my answer in simplest form. 5x-3/6 - x+3/6........My answer is 4x-1 Am I right?

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subtract 6 h 30 min
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A railing for a deck requires pieces of cedar 4ft 8 in., 11 ft 7 in and 9 ft 3 in long. what is the total length of material that is ne 5(2x-7)< -8