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S in (-oo:+oo)
S/12 = 1.5 // - 1.5
S/12-1.5 = 0
1/12*S-1.5 = 0 // + 1.5
1/12*S = 1.5 // : 1/12
S = 1.5/1/12
S = 18.00000072
S = 18.00000072
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