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x in (-oo:+oo)
Y = (8/3)*x-3 // - (8/3)*x-3
Y-((8/3)*x)+3 = 0
Y+(-8/3)*x+3 = 0
Y-8/3*x+3 = 0 // - Y+3
-8/3*x = -(Y+3) // : -8/3
x = (-(Y+3))/(-8/3)
x = 3/8*(Y+3)
x = 3/8*(Y+3)
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