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S in (-oo:+oo)
S/10.5 = 42 // - 42
S/10.5-42 = 0
0.0952381*S-42 = 0 // + 42
0.0952381*S = 42 // : 0.0952381
S = 42/0.0952381
S = 440.99997795
S = 440.99997795
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