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m in (-oo:+oo)
m/10 = 50/20 // - 50/20
m/10-(50/20) = 0
m/10-5/2 = 0
1/10*m-5/2 = 0 // + 5/2
1/10*m = 5/2 // : 1/10
m = 5/2/1/10
m = 25
m = 25
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