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