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m in (-oo:+oo)
(1/3)*m+2/3 = 7*m+14/3 // - 7*m+14/3
(1/3)*m-(7*m)+2/3-(14/3) = 0
(1/3)*m-7*m+2/3-14/3 = 0
-20/3*m-4 = 0 // + 4
-20/3*m = 4 // : -20/3
m = 4/(-20/3)
m = -3/5
m = -3/5
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