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m in (-oo:+oo)
(3/7)*m-1 = -11/14 // + -11/14
(3/7)*m-(-11/14)-1 = 0
(3/7)*m+11/14-1 = 0
3/7*m-3/14 = 0 // + 3/14
3/7*m = 3/14 // : 3/7
m = 3/14/3/7
m = 1/2
m = 1/2
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