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