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