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m in (-oo:+oo)
(2/7)*m+2/3 = 6/7 // - 6/7
(2/7)*m+2/3-(6/7) = 0
(2/7)*m+2/3-6/7 = 0
2/7*m-4/21 = 0 // + 4/21
2/7*m = 4/21 // : 2/7
m = 4/21/2/7
m = 2/3
m = 2/3
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