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m in (-oo:+oo)
(2/7)*m+3 = 221/77 // - 221/77
(2/7)*m-(221/77)+3 = 0
(2/7)*m-221/77+3 = 0
2/7*m+10/77 = 0 // - 10/77
2/7*m = -10/77 // : 2/7
m = -10/77/2/7
m = -5/11
m = -5/11
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