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