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x in (-oo:+oo)
X-(4/4) = 0.3*x // - 0.3*x
X-(0.3*x)-(4/4) = 0
X-0.3*x-1 = 0
X-0.3*x-1 = 0 // - X-1
-0.3*x = -(X-1) // : -0.3
x = (-(X-1))/(-0.3)
x = -3.33333333*(1-X)
x = -3.33333333*(1-X)
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