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x in (-oo:+oo)
X-12 = (2/3)*x // - (2/3)*x
X-((2/3)*x)-12 = 0
X+(-2/3)*x-12 = 0
X-2/3*x-12 = 0 // - X-12
-2/3*x = -(X-12) // : -2/3
x = (-(X-12))/(-2/3)
x = -3/2*(12-X)
x = -3/2*(12-X)
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