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x in (-oo:+oo)
y = (1/8)*x+31 // - (1/8)*x+31
y-((1/8)*x)-31 = 0
(-1/8)*x+y-31 = 0
y-1/8*x-31 = 0 // - y-31
-1/8*x = -(y-31) // : -1/8
x = (-(y-31))/(-1/8)
x = -8*(31-y)
x = -8*(31-y)
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