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m in (-oo:+oo)
m/5+6 = m/4+3 // - m/4+3
m/5-(m/4)-3+6 = 0
3-1/20*m = 0 // - 3
-1/20*m = -3 // : -1/20
m = -3/(-1/20)
m = 60
m = 60
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