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