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m in (-oo:+oo)
m/4 = -2/5 // + -2/5
m/4-(-2/5) = 0
m/4+2/5 = 0
1/4*m+2/5 = 0 // - 2/5
1/4*m = -2/5 // : 1/4
m = -2/5/1/4
m = -8/5
m = -8/5
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