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m in (-oo:+oo)
2/3-(9*m)+12 = 0
2/3-9*m+12 = 0
38/3-9*m = 0 // - 38/3
-9*m = -38/3 // : -9
m = -38/3/(-9)
m = 38/27
m = 38/27
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