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x in (-oo:+oo)
y-12 = (1/2)*(x-9) // - (1/2)*(x-9)
y-((1/2)*(x-9))-12 = 0
(-1/2)*(x-9)+y-12 = 0
y-1/2*(x-9)-12 = 0
y-1/2*(x-9)-12 = 0
y-1/2*x-12+9/2 = 0
y-1/2*x-15/2 = 0
y-1/2*x-15/2 = 0
y-1/2*x-15/2 = 0 // - y-15/2
-1/2*x = -(y-15/2) // : -1/2
x = (-(y-15/2))/(-1/2)
x = -2*(15/2-y)
x = -2*(15/2-y)
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