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