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m in (-oo:+oo)
3-7*m = 19/11 // - 19/11
3-7*m-(19/11) = 0
3-7*m-19/11 = 0
14/11-7*m = 0 // - 14/11
-7*m = -14/11 // : -7
m = -14/11/(-7)
m = 2/11
m = 2/11
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