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x in (-oo:+oo)
(1/3)*(12*x-3)-x = 4*x // - 4*x
(1/3)*(12*x-3)-x-(4*x) = 0
(1/3)*(12*x-3)-x-4*x = 0
1/3*(12*x-3)-x-4*x = 0
1/3*(12*x-3)-x-4*x = 0
3*x-4*x-1 = 0
-x-1 = 0
-x-1 = 0
-x-1 = 0 // + 1
-x = 1 // * -1
x = -1
x = -1
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