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ok from "3x^2 - 6ax - y^2 = 0", you can make y^2 the subject of the formula
so, "y^2 = 3x^2 - 6ax"
then substitute "y^2" into the equation of the curve and solve for "x"
Ohhhh How stupid of me
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How to solve "4x^3 - 6ax^2 -6a^2x = 0"