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