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s in (-oo:+oo)
(3/4)*s+(1/5)*s = 4/5 // - 4/5
(3/4)*s+(1/5)*s-(4/5) = 0
(3/4)*s+(1/5)*s-4/5 = 0
19/20*s-4/5 = 0 // + 4/5
19/20*s = 4/5 // : 19/20
s = 4/5/19/20
s = 16/19
s = 16/19
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