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