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x in (-oo:+oo)
z = (x-90)/6.4 // - (x-90)/6.4
z-((x-90)/6.4) = 0
z-0.15625*(x-90) = 0
z-0.15625*(x-90) = 0
z-0.15625*x+14.0625 = 0
z-0.15625*x+14.0625 = 0
z-0.15625*x+14.0625 = 0 // - z+14.0625
-0.15625*x = -(z+14.0625) // : -0.15625
x = (-(z+14.0625))/(-0.15625)
x = 6.4*(z+14.0625)
x = 6.4*(z+14.0625)
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