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