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b in (-oo:+oo)
-5*b-9 = -37/3 // + -37/3
-5*b-(-37/3)-9 = 0
37/3-5*b-9 = 0
10/3-5*b = 0 // - 10/3
-5*b = -10/3 // : -5
b = -10/3/(-5)
b = 2/3
b = 2/3
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