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x in (-oo:+oo)
(2*(x+6))/7 = 3*x-1 // - 3*x-1
(2*(x+6))/7-(3*x)+1 = 0
(2*(x+6))/7-3*x+1 = 0
(2*(x+6))/7+(-3*7*x)/7+(1*7)/7 = 0
2*(x+6)-3*7*x+1*7 = 0
7-19*x+12 = 0
19-19*x = 0
(19-19*x)/7 = 0
(19-19*x)/7 = 0 // * 7
19-19*x = 0
19-19*x = 0 // - 19
-19*x = -19 // : -19
x = -19/(-19)
x = 1
x = 1
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