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s in (-oo:+oo)
(2*s)/3-((26-s)/5) = 0
(-1*(26-s))/5+(2*s)/3 = 0
(-1*3*(26-s))/(3*5)+(2*5*s)/(3*5) = 0
2*5*s-1*3*(26-s) = 0
13*s-78 = 0
(13*s-78)/(3*5) = 0
(13*s-78)/(3*5) = 0 // * 3*5
13*s-78 = 0
13*s-78 = 0 // + 78
13*s = 78 // : 13
s = 78/13
s = 6
s = 6
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