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