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s in (-oo:+oo)
3/2-((9/4)*(s-1)) = 0
(-9/4)*(s-1)+3/2 = 0
3/2-9/4*(s-1) = 0
(-9/4*2*(s-1))/2+3/2 = 0
3-9/4*2*(s-1) = 0
15/2-9/2*s = 0
(15/2-9/2*s)/2 = 0
(15/2-9/2*s)/2 = 0 // * 2
15/2-9/2*s = 0
15/2-9/2*s = 0 // - 15/2
-9/2*s = -15/2 // : -9/2
s = -15/2/(-9/2)
s = 5/3
s = 5/3
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