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m in (-oo:+oo)
3 = (-5/4)*m // - (-5/4)*m
3-((-5/4)*m) = 0
(5/4)*m+3 = 0
5/4*m+3 = 0 // - 3
5/4*m = -3 // : 5/4
m = -3/5/4
m = -12/5
m = -12/5
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