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S in (-oo:+oo)
S/5 = 1/4 // - 1/4
S/5-(1/4) = 0
S/5-1/4 = 0
1/5*S-1/4 = 0 // + 1/4
1/5*S = 1/4 // : 1/5
S = 1/4/1/5
S = 5/4
S = 5/4
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