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m in (-oo:+oo)
235/27 = (1/3)*m-m+9 // - (1/3)*m-m+9
m-((1/3)*m)+235/27-9 = 0
m+(-1/3)*m+235/27-9 = 0
2/3*m-8/27 = 0 // + 8/27
2/3*m = 8/27 // : 2/3
m = 8/27/2/3
m = 4/9
m = 4/9
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