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