exam Maths Puzzle Numerical Ability

xy+xz=2
yx+yz=2
xz+yz=2

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exam Other Question

cubed root of (4 + 6t) - cubed root of (1 - 8t) = 0 Solve the equation.
cuberoot2^(2-x) = 2^(x^2)
This problem is very confusing for me, please help!