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m in (-oo:+oo)
13/13 = 5*m-2 // - 5*m-2
13/13-(5*m)+2 = 0
13/13-5*m+2 = 0
3-5*m = 0 // - 3
-5*m = -3 // : -5
m = -3/(-5)
m = 3/5
m = 3/5
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