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x in (-oo:+oo)
y = (1/4)*x-3 // - (1/4)*x-3
y-((1/4)*x)+3 = 0
(-1/4)*x+y+3 = 0
y-1/4*x+3 = 0 // - y+3
-1/4*x = -(y+3) // : -1/4
x = (-(y+3))/(-1/4)
x = 4*(y+3)
x = 4*(y+3)
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