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s in (-oo:+oo)
s/7-3.9 = 1.05 // - 1.05
s/7-3.9-1.05 = 0
1/7*s-4.95 = 0 // + 4.95
1/7*s = 4.95 // : 1/7
s = 4.95/1/7
s = 34.65000069
s = 34.65000069
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