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m in (-oo:+oo)
49 = 7*m+m+9 // - 7*m+m+9
49-(7*m)-m-9 = 0
49-7*m-m-9 = 0
40-8*m = 0 // - 40
-8*m = -40 // : -8
m = -40/(-8)
m = 5
m = 5
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