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b in (-oo:+oo)
b/0.2 = -2.6 // + 2.6
b/0.2+2.6 = 0
5*b+2.6 = 0 // - 2.6
5*b = -2.6 // : 5
b = -2.6/5
b = -0.52
b = -0.52
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