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