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m in (-oo:+oo)
m+(12/9)*m = 6/9 // - 6/9
m+(12/9)*m-(6/9) = 0
m+(12/9)*m-2/3 = 0
7/3*m-2/3 = 0 // + 2/3
7/3*m = 2/3 // : 7/3
m = 2/3/7/3
m = 2/7
m = 2/7
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