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x in (-oo:+oo)
y = 2*x-(9/3) // - 2*x-(9/3)
y-(2*x)+9/3 = 0
y-2*x+9/3 = 0
y-2*x+3 = 0 // - y+3
-2*x = -(y+3) // : -2
x = (-(y+3))/(-2)
x = (y+3)/2
x = (y+3)/2
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