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(X^2)/5-((4*x^1)/3)-5 = 0
(X^2)/5+(-4/3)*x-5 = 0
1/5*X^2-4/3*x-5 = 0 // - 1/5*X^2-5
-4/3*x = -(1/5*X^2-5) // : -4/3
x = (-(1/5*X^2-5))/(-4/3)
x = -3/4*(5-(1/5*X^2))
x = -3/4*(5-(1/5*X^2))
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