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s in (-oo:+oo)
(0.3*s-2)/5 = -2 // + 2
(0.3*s-2)/5+2 = 0
(0.3*s-2)/5+(2*5)/5 = 0
0.3*s+2*5-2 = 0
0.3*s+8 = 0
(0.3*s+8)/5 = 0
(0.3*s+8)/5 = 0 // * 5
0.3*s+8 = 0
0.3*s+8 = 0 // - 8
0.3*s = -8 // : 0.3
s = -8/0.3
s = -26.66666667
s = -26.66666667
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