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m in (-oo:+oo)
m/5+4 = m/3+2 // - m/3+2
m/5-(m/3)-2+4 = 0
2-2/15*m = 0 // - 2
-2/15*m = -2 // : -2/15
m = -2/(-2/15)
m = 15
m = 15
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