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x in (-oo:+oo)
X-500 = (2*x)/3 // - (2*x)/3
X-((2*x)/3)-500 = 0
X+(-2/3)*x-500 = 0
X-2/3*x-500 = 0 // - X-500
-2/3*x = -(X-500) // : -2/3
x = (-(X-500))/(-2/3)
x = -3/2*(500-X)
x = -3/2*(500-X)
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