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b in (-oo:+oo)
31 = (-1/6)*b // - (-1/6)*b
31-((-1/6)*b) = 0
(1/6)*b+31 = 0
1/6*b+31 = 0 // - 31
1/6*b = -31 // : 1/6
b = -31/1/6
b = -186
b = -186
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