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