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S in (-oo:+oo)
S/7.81 = 11 // - 11
S/7.81-11 = 0
0.12804097*S-11 = 0 // + 11
0.12804097*S = 11 // : 0.12804097
S = 11/0.12804097
S = 85.91000209
S = 85.91000209
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