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x in (-oo:+oo)
y = 3-(x/2) // - 3-(x/2)
x/2+y-3 = 0
1/2*x+y-3 = 0 // - y-3
1/2*x = -(y-3) // : 1/2
x = (-(y-3))/1/2
x = 2*(3-y)
x = 2*(3-y)
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