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m in (-oo:+oo)
-5*m-6 = 7*m-138 // - 7*m-138
138-5*m-(7*m)-6 = 0
138-5*m-7*m-6 = 0
132-12*m = 0 // - 132
-12*m = -132 // : -12
m = -132/(-12)
m = 11
m = 11
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