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