exam Maths Puzzle Numerical Ability

I know that this problem may be an easy one, but I am not sure if I am correct.

5x-3/6 - x+5/6

I have come up with 5/6. Am I correct with this answer???

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exam Other Question

Science and medicine. Celsius temperature readings can be converted to
Fahrenheit readings using the formula E=9/5C+32. What is the Fahrenheit
temperature that corresponds to each of the following Celsius temperatures: -10,
0, 15, 100? Which describes the number and type of roots of the equation x(squared)-625=0?