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x in (-oo:+oo)
y+4 = (1/2)*(x-4) // - (1/2)*(x-4)
y-((1/2)*(x-4))+4 = 0
(-1/2)*(x-4)+y+4 = 0
y-1/2*(x-4)+4 = 0
y-1/2*(x-4)+4 = 0
y-1/2*x+2+4 = 0
y-1/2*x+6 = 0
y-1/2*x+6 = 0
y-1/2*x+6 = 0 // - y+6
-1/2*x = -(y+6) // : -1/2
x = (-(y+6))/(-1/2)
x = 2*(y+6)
x = 2*(y+6)
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