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m in (-oo:+oo)
(2/3)*m-1 = (2/3)*m-1 // - (2/3)*m-1
(2/3)*m-((2/3)*m)-1+1 = 0
(2/3)*m+(-2/3)*m-1+1 = 0
0 = 0
m naleu017Cy do R
m in (-oo:+oo)
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