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x in (-oo:+oo)
(7/3)*(6*x-3) = (6/7)*(14*x-21) // - (6/7)*(14*x-21)
(7/3)*(6*x-3)-((6/7)*(14*x-21)) = 0
(7/3)*(6*x-3)+(-6/7)*(14*x-21) = 0
7/3*(6*x-3)-6/7*(14*x-21) = 0
7/3*(6*x-3)-6/7*(14*x-21) = 0
2*x+11 = 0
2*x+11 = 0
2*x+11 = 0 // - 11
2*x = -11 // : 2
x = -11/2
x = -11/2
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