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m in (-oo:+oo)
7-3*m-(5*m) = -89 // + 89
7-3*m-(5*m)+89 = 0
7-3*m-5*m+89 = 0
96-8*m = 0 // - 96
-8*m = -96 // : -8
m = -96/(-8)
m = 12
m = 12
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