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x in (-oo:+oo)
X-(1/3) = (2*x)/5 // - (2*x)/5
X-((2*x)/5)-(1/3) = 0
X+(-2/5)*x-1/3 = 0
X-2/5*x-1/3 = 0 // - X-1/3
-2/5*x = -(X-1/3) // : -2/5
x = (-(X-1/3))/(-2/5)
x = -5/2*(1/3-X)
x = -5/2*(1/3-X)
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