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m in (-oo:+oo)
7*m-9 = 4*m-6 // - 4*m-6
7*m-(4*m)-9+6 = 0
7*m-4*m-9+6 = 0
3*m-3 = 0 // + 3
3*m = 3 // : 3
m = 3/3
m = 1
m = 1
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