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x in (-oo:+oo)
(1/2)*x-(4*y) = 2 // - 2
(1/2)*x-(4*y)-2 = 0
(1/2)*x-4*y-2 = 0
1/2*x-4*y-2 = 0 // + -4*y-2
1/2*x = -(-4*y-2) // : 1/2
x = (-(-4*y-2))/1/2
x = 2*(2-(-4*y))
x = 2*(2-(-4*y))
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