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s in (-oo:+oo)
(1/4)*(36*s+100) = 15-(4*s) // - 15-(4*s)
(1/4)*(36*s+100)+4*s-15 = 0
1/4*(36*s+100)+4*s-15 = 0
1/4*(36*s+100)+4*s-15 = 0
13*s-15+25 = 0
13*s+10 = 0
13*s+10 = 0
13*s+10 = 0 // - 10
13*s = -10 // : 13
s = -10/13
s = -10/13
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