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x in (-oo:+oo)
y = 0.25*x-(2/3) // - 0.25*x-(2/3)
y-(0.25*x)+2/3 = 0
y-0.25*x+2/3 = 0
y-0.25*x+2/3 = 0 // - y+2/3
-0.25*x = -(y+2/3) // : -0.25
x = (-(y+2/3))/(-0.25)
x = 4*(y+2/3)
x = 4*(y+2/3)
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