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x in (-oo:+oo)
(1/3)*x = 1-((1/2)*y) // - 1-((1/2)*y)
(1/3)*x+(1/2)*y-1 = 0
1/3*x+1/2*y-1 = 0 // - 1/2*y-1
1/3*x = -(1/2*y-1) // : 1/3
x = (-(1/2*y-1))/1/3
x = 3*(1-(1/2*y))
x = 3*(1-(1/2*y))
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