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m in (-oo:+oo)
5-m = 7*m-91 // - 7*m-91
5-m-(7*m)+91 = 0
5-m-7*m+91 = 0
96-8*m = 0 // - 96
-8*m = -96 // : -8
m = -96/(-8)
m = 12
m = 12
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