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