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