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m in (-oo:+oo)
8-(7*m)-(2*m) = -46 // + 46
8-(7*m)-(2*m)+46 = 0
8-7*m-2*m+46 = 0
54-9*m = 0 // - 54
-9*m = -54 // : -9
m = -54/(-9)
m = 6
m = 6
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