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x in (-oo:+oo)
(2/3)*(x-4) = (3/7)*(7*x-3) // - (3/7)*(7*x-3)
(2/3)*(x-4)-((3/7)*(7*x-3)) = 0
(2/3)*(x-4)+(-3/7)*(7*x-3) = 0
2/3*(x-4)-3/7*(7*x-3) = 0
2/3*(x-4)-3/7*(7*x-3) = 0
-7/3*x-29/21 = 0
-7/3*x-29/21 = 0
-7/3*x-29/21 = 0 // + 29/21
-7/3*x = 29/21 // : -7/3
x = 29/21/(-7/3)
x = -29/49
x = -29/49
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