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x in (-oo:+oo)
y = 11-((2/3)*x) // - 11-((2/3)*x)
(2/3)*x+y-11 = 0
2/3*x+y-11 = 0 // - y-11
2/3*x = -(y-11) // : 2/3
x = (-(y-11))/2/3
x = 3/2*(11-y)
x = 3/2*(11-y)
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