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