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x in (-oo:+oo)
X^2-((3/4)*x) = 9/8 // - 9/8
X^2-((3/4)*x)-(9/8) = 0
X^2+(-3/4)*x-9/8 = 0
X^2-3/4*x-9/8 = 0 // - X^2-9/8
-3/4*x = -(X^2-9/8) // : -3/4
x = (-(X^2-9/8))/(-3/4)
x = -4/3*(9/8-X^2)
x = -4/3*(9/8-X^2)
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