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x in (-oo:+oo)
(1/2)*x = 2*y-6 // - 2*y-6
(1/2)*x-(2*y)+6 = 0
(1/2)*x-2*y+6 = 0
1/2*x-2*y+6 = 0 // - 6-2*y
1/2*x = -(6-2*y) // : 1/2
x = (-(6-2*y))/1/2
x = -2*(6-2*y)
x = -2*(6-2*y)
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