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m in (-oo:+oo)
(-2/3)*m+(3/5)*m+1 = 22/15 // - 22/15
(-2/3)*m+(3/5)*m-(22/15)+1 = 0
(-2/3)*m+(3/5)*m-22/15+1 = 0
-1/15*m-7/15 = 0 // + 7/15
-1/15*m = 7/15 // : -1/15
m = 7/15/(-1/15)
m = -7
m = -7
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