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