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x in (-oo:+oo)
(1/2)*x+(1/6)*y = 2 // - 2
(1/2)*x+(1/6)*y-2 = 0
1/2*x+1/6*y-2 = 0 // - 1/6*y-2
1/2*x = -(1/6*y-2) // : 1/2
x = (-(1/6*y-2))/1/2
x = 2*(2-(1/6*y))
x = 2*(2-(1/6*y))
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