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