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m in (-oo:+oo)
m/5+6 = m/4+5 // - m/4+5
m/5-(m/4)-5+6 = 0
1-1/20*m = 0 // - 1
-1/20*m = -1 // : -1/20
m = -1/(-1/20)
m = 20
m = 20
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