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