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b in (-oo:+oo)
3.6/9 = b/0.5 // - b/0.5
3.6/9-(b/0.5) = 0
3.6/9-2*b = 0
0.4-2*b = 0 // - 0.4
-2*b = -0.4 // : -2
b = -0.4/(-2)
b = 0.2
b = 0.2
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