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m in (-oo:+oo)
8/9 = (-1/3)*m+5*m+8/9 // - (-1/3)*m+5*m+8/9
8/9-((-1/3)*m)-(5*m)-(8/9) = 0
(1/3)*m-5*m+8/9-8/9 = 0
-14/3*m = 0 // : -14/3
m = 0
m = 0
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