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m in (-oo:+oo)
5-((2/7)*m) = 19/7 // - 19/7
5-((2/7)*m)-(19/7) = 0
(-2/7)*m-19/7+5 = 0
16/7-2/7*m = 0 // - 16/7
-2/7*m = -16/7 // : -2/7
m = -16/7/(-2/7)
m = 8
m = 8
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