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m in (-oo:+oo)
m/(-5) = -1/3 // + -1/3
m/(-5)-(-1/3) = 0
m/(-5)+1/3 = 0
1/3-1/5*m = 0 // - 1/3
-1/5*m = -1/3 // : -1/5
m = -1/3/(-1/5)
m = 5/3
m = 5/3
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