exam Maths Puzzle Numerical Ability

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This formula for calculating the amount of money returned for an initial deposit into a bank account or CD (certificate of deposit) is

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exam Other Question

i need help solving this:
(x-radical y-z)-(x+radical y-z)-(radical y+z-x)
How many solutions are in the equation: (-2x+y=1, -4x+2y=-8)