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m in (-oo:+oo)
4*(9-1*m) = -8 // + 8
4*(9-1*m)+8 = 0
4*(9-m)+8 = 0
4*(9-m)+8 = 0
44-4*m = 0
44-4*m = 0
44-4*m = 0 // - 44
-4*m = -44 // : -4
m = -44/(-4)
m = 11
m = 11
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