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x in (-oo:+oo)
k = (2/5)*x // - (2/5)*x
k-((2/5)*x) = 0
k+(-2/5)*x = 0
k-2/5*x = 0 // - k
-2/5*x = -k // : -2/5
x = -k/(-2/5)
x = 5/2*k
x = 5/2*k
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