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s in (-oo:+oo)
(1/5)*s+(2/3)*s = 6 // - 6
(1/5)*s+(2/3)*s-6 = 0
13/15*s-6 = 0 // + 6
13/15*s = 6 // : 13/15
s = 6/13/15
s = 90/13
s = 90/13
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