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m in (-oo:+oo)
-7*m-2 = 5*m-122 // - 5*m-122
122-7*m-(5*m)-2 = 0
122-7*m-5*m-2 = 0
120-12*m = 0 // - 120
-12*m = -120 // : -12
m = -120/(-12)
m = 10
m = 10
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