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m in (-oo:+oo)
(-1/8)*m = -2/7 // + -2/7
(-1/8)*m-(-2/7) = 0
(-1/8)*m+2/7 = 0
2/7-1/8*m = 0 // - 2/7
-1/8*m = -2/7 // : -1/8
m = -2/7/(-1/8)
m = 16/7
m = 16/7
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