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S in (-oo:+oo)
S/5 = 9/3 // - 9/3
S/5-(9/3) = 0
S/5-3 = 0
1/5*S-3 = 0 // + 3
1/5*S = 3 // : 1/5
S = 3/1/5
S = 15
S = 15
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