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m in (-oo:+oo)
28 = (-7/4)*m // - (-7/4)*m
28-((-7/4)*m) = 0
(7/4)*m+28 = 0
7/4*m+28 = 0 // - 28
7/4*m = -28 // : 7/4
m = -28/7/4
m = -16
m = -16
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