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m in (-oo:+oo)
(-2/3)*m-1 = -17/27 // + -17/27
(-2/3)*m-(-17/27)-1 = 0
(-2/3)*m+17/27-1 = 0
-2/3*m-10/27 = 0 // + 10/27
-2/3*m = 10/27 // : -2/3
m = 10/27/(-2/3)
m = -5/9
m = -5/9
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