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s in (-oo:+oo)
(-2/3)*s = 15/6 // - 15/6
(-2/3)*s-(15/6) = 0
(-2/3)*s-5/2 = 0
-2/3*s-5/2 = 0 // + 5/2
-2/3*s = 5/2 // : -2/3
s = 5/2/(-2/3)
s = -15/4
s = -15/4
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