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x in (-oo:+oo)
y = 13/3-((2/3)*x) // - 13/3-((2/3)*x)
(2/3)*x+y-(13/3) = 0
(2/3)*x+y-13/3 = 0
2/3*x+y-13/3 = 0 // - y-13/3
2/3*x = -(y-13/3) // : 2/3
x = (-(y-13/3))/2/3
x = 3/2*(13/3-y)
x = 3/2*(13/3-y)
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