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