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X in (-oo:+oo)
X = (5*4^-1)/2 // - (5*4^-1)/2
X-((5*4^-1)/2) = 0
X+(-5/2)*4^-1 = 0
X-5/8 = 0 // + 5/8
X = 5/8
X = 5/8
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