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x in (-oo:+oo)
Y = (3/8)*x-(1/9) // - (3/8)*x-(1/9)
Y-((3/8)*x)+1/9 = 0
Y+(-3/8)*x+1/9 = 0
Y-3/8*x+1/9 = 0 // - Y+1/9
-3/8*x = -(Y+1/9) // : -3/8
x = (-(Y+1/9))/(-3/8)
x = 8/3*(Y+1/9)
x = 8/3*(Y+1/9)
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