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