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