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m in (-oo:+oo)
6 = (2/3)*m-1 // - (2/3)*m-1
1-((2/3)*m)+6 = 0
(-2/3)*m+1+6 = 0
7-2/3*m = 0 // - 7
-2/3*m = -7 // : -2/3
m = -7/(-2/3)
m = 21/2
m = 21/2
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