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