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m in (-oo:+oo)
-4*m-9 = 3*m-16 // - 3*m-16
16-4*m-(3*m)-9 = 0
16-4*m-3*m-9 = 0
7-7*m = 0 // - 7
-7*m = -7 // : -7
m = -7/(-7)
m = 1
m = 1
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