exam Maths Puzzle Numerical Ability

can you please help me solve and check: (((x-2 over 2 - x+2 over4 = 1 over 2)))

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exam Other Question

|x+6|+8=4 Fat Chance can row his boat 9 miles up Moss Creek in the same time that it takes him to row 15 miles down the creek. If fat can row 2 miles per hour in still water, how fast is the current in Moss Creek?