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m in (-oo:+oo)
m/10 = 4/8 // - 4/8
m/10-(4/8) = 0
m/10-1/2 = 0
1/10*m-1/2 = 0 // + 1/2
1/10*m = 1/2 // : 1/10
m = 1/2/1/10
m = 5
m = 5
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