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x in (-oo:+oo)
y-9 = (1/2)*(x-5) // - (1/2)*(x-5)
y-((1/2)*(x-5))-9 = 0
(-1/2)*(x-5)+y-9 = 0
y-1/2*(x-5)-9 = 0
y-1/2*(x-5)-9 = 0
y-1/2*x-9+5/2 = 0
y-1/2*x-13/2 = 0
y-1/2*x-13/2 = 0
y-1/2*x-13/2 = 0 // - y-13/2
-1/2*x = -(y-13/2) // : -1/2
x = (-(y-13/2))/(-1/2)
x = -2*(13/2-y)
x = -2*(13/2-y)
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