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S in (-oo:+oo)
S/1.4 = 12 // - 12
S/1.4-12 = 0
0.71428571*S-12 = 0 // + 12
0.71428571*S = 12 // : 0.71428571
S = 12/0.71428571
S = 16.8000001
S = 16.8000001
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