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x in (-oo:+oo)
y = (1/4)*x-1.25 // - (1/4)*x-1.25
y-((1/4)*x)+1.25 = 0
(-1/4)*x+y+1.25 = 0
y-1/4*x+1.25 = 0 // - y+1.25
-1/4*x = -(y+1.25) // : -1/4
x = (-(y+1.25))/(-1/4)
x = 4*(y+1.25)
x = 4*(y+1.25)
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