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b in (-oo:+oo)
(-31/12)*b = -37/9 // + -37/9
(-31/12)*b-(-37/9) = 0
(-31/12)*b+37/9 = 0
37/9-31/12*b = 0 // - 37/9
-31/12*b = -37/9 // : -31/12
b = -37/9/(-31/12)
b = 148/93
b = 148/93
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