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x in (-oo:+oo)
y-8 = (-1/2)*(x-3) // - (-1/2)*(x-3)
y-((-1/2)*(x-3))-8 = 0
(1/2)*(x-3)+y-8 = 0
1/2*(x-3)+y-8 = 0
1/2*(x-3)+y-8 = 0
1/2*x+y-8-3/2 = 0
1/2*x+y-19/2 = 0
1/2*x+y-19/2 = 0
1/2*x+y-19/2 = 0 // - y-19/2
1/2*x = -(y-19/2) // : 1/2
x = (-(y-19/2))/1/2
x = 2*(19/2-y)
x = 2*(19/2-y)
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