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m in (-oo:+oo)
(-2/3)*m-9 = -83/9 // + -83/9
(-2/3)*m-(-83/9)-9 = 0
(-2/3)*m+83/9-9 = 0
2/9-2/3*m = 0 // - 2/9
-2/3*m = -2/9 // : -2/3
m = -2/9/(-2/3)
m = 1/3
m = 1/3
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