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