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m in (-oo:+oo)
2/8 = 2*m // - 2*m
2/8-(2*m) = 0
2/8-2*m = 0
1/4-2*m = 0 // - 1/4
-2*m = -1/4 // : -2
m = -1/4/(-2)
m = 1/8
m = 1/8
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