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m in (-oo:+oo)
m/5+4 = 25/4 // - 25/4
m/5-(25/4)+4 = 0
m/5-25/4+4 = 0
1/5*m-9/4 = 0 // + 9/4
1/5*m = 9/4 // : 1/5
m = 9/4/1/5
m = 45/4
m = 45/4
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