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m in (-oo:+oo)
m/15-1 = m-(43/45) // - m-(43/45)
m/15-m+43/45-1 = 0
-14/15*m-2/45 = 0 // + 2/45
-14/15*m = 2/45 // : -14/15
m = 2/45/(-14/15)
m = -1/21
m = -1/21
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