exam Maths Puzzle Numerical Ability

solve:
7/x - 2 = 4/x + 3

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exam Other Question

How can I use these regions to find max. & min. values of the given objective functions? Your help is received with many thanks.
z = 4x + y
z = 5x + 6y
z = x + 2y
z = x + 6y
3x-5y=20