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x in (-oo:+oo)
Y = (1/4)*x-(2/3) // - (1/4)*x-(2/3)
Y-((1/4)*x)+2/3 = 0
Y+(-1/4)*x+2/3 = 0
Y-1/4*x+2/3 = 0 // - Y+2/3
-1/4*x = -(Y+2/3) // : -1/4
x = (-(Y+2/3))/(-1/4)
x = 4*(Y+2/3)
x = 4*(Y+2/3)
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