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m in (-oo:+oo)
-18 = 7*m-(6*m)-6 // - 7*m-(6*m)-6
6*m-(7*m)-18+6 = 0
6*m-7*m-18+6 = 0
-m-12 = 0 // + 12
-m = 12 // * -1
m = -12
m = -12
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