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m in (-oo:+oo)
(2/7)*m-(4*m)-4 = -149/21 // + -149/21
(2/7)*m-(4*m)-(-149/21)-4 = 0
(2/7)*m-4*m+149/21-4 = 0
65/21-26/7*m = 0 // - 65/21
-26/7*m = -65/21 // : -26/7
m = -65/21/(-26/7)
m = 5/6
m = 5/6
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