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