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m in (-oo:+oo)
m/4 = 25/5 // - 25/5
m/4-(25/5) = 0
m/4-5 = 0
1/4*m-5 = 0 // + 5
1/4*m = 5 // : 1/4
m = 5/1/4
m = 20
m = 20
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