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m in (-oo:+oo)
6*m-7 = 7*m-11 // - 7*m-11
6*m-(7*m)-7+11 = 0
6*m-7*m-7+11 = 0
4-m = 0 // - 4
-m = -4 // * -1
m = 4
m = 4
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