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X^2-(7*x)-(17/4) = 0
X^2-7*x-17/4 = 0
X^2-7*x-17/4 = 0 // - X^2-17/4
-7*x = -(X^2-17/4) // : -7
x = (-(X^2-17/4))/(-7)
x = (17/4-X^2)/(-7)
x = (17/4-X^2)/(-7)
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