x^2/y^3 = x^2*y^(-3)
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solutions of the equation: x2-x=20
You mean this x2?
x2 + 5x - 6x = x2 - x = x(x - 1) which is zero when x = 0 or x = 1
1 over x2 - 4 is the multiplicative inverse of x2 minus four 1/x2 - 4
Write it as x2 - 2x - 4 = 0, and solve with the quadratic formula (a = 1, b = -2, c = -4).