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x in (-oo:+oo)
(2/3)*(6-(3*x)) = 12*x // - 12*x
(2/3)*(6-(3*x))-(12*x) = 0
(2/3)*(6-3*x)-12*x = 0
2/3*(6-3*x)-12*x = 0
2/3*(6-3*x)-12*x = 0
4-14*x = 0
4-14*x = 0
4-14*x = 0 // - 4
-14*x = -4 // : -14
x = -4/(-14)
x = 2/7
x = 2/7
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