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