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x in (-oo:+oo)
(2/9)*x+(1/2)*y = 2 // - 2
(2/9)*x+(1/2)*y-2 = 0
2/9*x+1/2*y-2 = 0 // - 1/2*y-2
2/9*x = -(1/2*y-2) // : 2/9
x = (-(1/2*y-2))/2/9
x = 9/2*(2-(1/2*y))
x = 9/2*(2-(1/2*y))
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