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x in (-oo:+oo)
y-(9*x) = 1/2 // - 1/2
y-(9*x)-(1/2) = 0
y-9*x-1/2 = 0
y-9*x-1/2 = 0 // - y-1/2
-9*x = -(y-1/2) // : -9
x = (-(y-1/2))/(-9)
x = (1/2-y)/(-9)
x = (1/2-y)/(-9)
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