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