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