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s in (-oo:+oo)
(1/4)*(60-(16*s)) = 4*s+15 // - 4*s+15
(1/4)*(60-(16*s))-(4*s)-15 = 0
(1/4)*(60-16*s)-4*s-15 = 0
1/4*(60-16*s)-4*s-15 = 0
1/4*(60-16*s)-4*s-15 = 0
15-8*s-15 = 0
-8*s = 0
-8*s = 0
-8*s = 0 // : -8
s = 0
s = 0
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