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m in (-oo:+oo)
(-14/4)*m = -7/2 // + -7/2
(-14/4)*m-(-7/2) = 0
(-14/4)*m+7/2 = 0
7/2-7/2*m = 0 // - 7/2
-7/2*m = -7/2 // : -7/2
m = -7/2/(-7/2)
m = 1
m = 1
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