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x in (-oo:+oo)
(1/2)*y-(4*x) = 9 // - 9
(1/2)*y-(4*x)-9 = 0
(1/2)*y-4*x-9 = 0
1/2*y-4*x-9 = 0 // - 1/2*y-9
-4*x = -(1/2*y-9) // : -4
x = (-(1/2*y-9))/(-4)
x = (9-(1/2*y))/(-4)
x = (9-(1/2*y))/(-4)
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