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