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s in (-oo:+oo)
(1.2*s+3.69)/0.3 = 47.9 // - 47.9
(1.2*s+3.69)/0.3-47.9 = 0
(1.2*s+3.69)/0.3+(-47.9*0.3)/0.3 = 0
1.2*s-47.9*0.3+3.69 = 0
1.2*s-10.68 = 0
(1.2*s-10.68)/0.3 = 0
(1.2*s-10.68)/0.3 = 0 // * 0.3
1.2*s-10.68 = 0
1.2*s-10.68 = 0 // + 10.68
1.2*s = 10.68 // : 1.2
s = 10.68/1.2
s = 8.9
s = 8.9
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