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x in (-oo:+oo)
X-((7/8)*x) = 1/8 // - 1/8
X-((7/8)*x)-(1/8) = 0
X+(-7/8)*x-1/8 = 0
X-7/8*x-1/8 = 0 // - X-1/8
-7/8*x = -(X-1/8) // : -7/8
x = (-(X-1/8))/(-7/8)
x = -8/7*(1/8-X)
x = -8/7*(1/8-X)
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