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s in (-oo:+oo)
s/13.21 = 5.2 // - 5.2
s/13.21-5.2 = 0
0.07570023*s-5.2 = 0 // + 5.2
0.07570023*s = 5.2 // : 0.07570023
s = 5.2/0.07570023
s = 68.69199737
s = 68.69199737
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