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s in (-oo:+oo)
(1*s)/5 = 20 // - 20
(1*s)/5-20 = 0
s/5-20 = 0
1/5*s-20 = 0 // + 20
1/5*s = 20 // : 1/5
s = 20/1/5
s = 100
s = 100
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