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b in (-oo:+oo)
1.2/1.2 = (-3*b)/1.2 // - (-3*b)/1.2
1.2/1.2-((-3*b)/1.2) = 0
2.5*b+1.2/1.2 = 0
2.5*b+1 = 0 // - 1
2.5*b = -1 // : 2.5
b = -1/2.5
b = -0.4
b = -0.4
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