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m in (-oo:+oo)
2*m-5 = -17/5 // + -17/5
2*m-(-17/5)-5 = 0
2*m+17/5-5 = 0
2*m-8/5 = 0 // + 8/5
2*m = 8/5 // : 2
m = 8/5/2
m = 4/5
m = 4/5
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