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