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