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s in (-oo:+oo)
150/9.7 = s/90 // - s/90
150/9.7-(s/90) = 0
15.46391753-1/90*s = 0 // - 15.46391753
-1/90*s = -15.46391753 // : -1/90
s = -15.46391753/(-1/90)
s = 1391.75271688
s = 1391.75271688
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