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m in (-oo:+oo)
m/3 = 4/5 // - 4/5
m/3-(4/5) = 0
m/3-4/5 = 0
1/3*m-4/5 = 0 // + 4/5
1/3*m = 4/5 // : 1/3
m = 4/5/1/3
m = 12/5
m = 12/5
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