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m in (-oo:+oo)
31/40 = (-17*m)/40 // - (-17*m)/40
31/40-((-17*m)/40) = 0
(17/40)*m+31/40 = 0
17/40*m+31/40 = 0 // - 31/40
17/40*m = -31/40 // : 17/40
m = -31/40/17/40
m = -31/17
m = -31/17
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