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m in (-oo:+oo)
3-4*m-(4*m) = 91 // - 91
3-4*m-(4*m)-91 = 0
3-4*m-4*m-91 = 0
-8*m-88 = 0 // + 88
-8*m = 88 // : -8
m = 88/(-8)
m = -11
m = -11
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