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s in (-oo:+oo)
(1/4)*(16*s+60) = 5*s+13 // - 5*s+13
(1/4)*(16*s+60)-(5*s)-13 = 0
(1/4)*(16*s+60)-5*s-13 = 0
1/4*(16*s+60)-5*s-13 = 0
1/4*(16*s+60)-5*s-13 = 0
15-s-13 = 0
2-s = 0
2-s = 0
2-s = 0 // - 2
-s = -2 // * -1
s = 2
s = 2
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