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s in (-oo:+oo)
(1/5)*(s+2/3)-((3/10)*s) = -1/5 // + -1/5
(1/5)*(s+2/3)-((3/10)*s)-(-1/5) = 0
(1/5)*(s+2/3)+(-3/10)*s+1/5 = 0
1/5*(s+2/3)+(-3*s)/10+1/5 = 0
(1/5*5*10*(s+2/3))/(5*10)+(-3*5*s)/(5*10)+(1*10)/(5*10) = 0
1/5*5*10*(s+2/3)-3*5*s+1*10 = 0
20/3-5*s+10 = 0
50/3-5*s = 0
(50/3-5*s)/(5*10) = 0
(50/3-5*s)/(5*10) = 0 // * 5*10
50/3-5*s = 0
50/3-5*s = 0 // - 50/3
-5*s = -50/3 // : -5
s = -50/3/(-5)
s = 10/3
s = 10/3
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