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x in (-oo:+oo)
y = 1/3-(5*x) // - 1/3-(5*x)
5*x+y-(1/3) = 0
5*x+y-1/3 = 0
5*x+y-1/3 = 0 // - y-1/3
5*x = -(y-1/3) // : 5
x = (-(y-1/3))/5
x = (1/3-y)/5
x = (1/3-y)/5
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