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m in (-oo:+oo)
m/4 = -5/3 // + -5/3
m/4-(-5/3) = 0
m/4+5/3 = 0
1/4*m+5/3 = 0 // - 5/3
1/4*m = -5/3 // : 1/4
m = -5/3/1/4
m = -20/3
m = -20/3
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