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