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s in (-oo:+oo)
(2*s)/3 = 4*s-60 // - 4*s-60
(2*s)/3-(4*s)+60 = 0
(2*s)/3-4*s+60 = 0
60-10/3*s = 0 // - 60
-10/3*s = -60 // : -10/3
s = -60/(-10/3)
s = 18
s = 18
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