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m in (-oo:+oo)
m-6 = 7*m-18 // - 7*m-18
m-(7*m)-6+18 = 0
m-7*m-6+18 = 0
12-6*m = 0 // - 12
-6*m = -12 // : -6
m = -12/(-6)
m = 2
m = 2
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