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m in (-oo:+oo)
m/5 = -5/6 // + -5/6
m/5-(-5/6) = 0
m/5+5/6 = 0
1/5*m+5/6 = 0 // - 5/6
1/5*m = -5/6 // : 1/5
m = -5/6/1/5
m = -25/6
m = -25/6
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