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x in (-oo:+oo)
y = 5/2-(3*x) // - 5/2-(3*x)
3*x+y-(5/2) = 0
3*x+y-5/2 = 0
3*x+y-5/2 = 0 // - y-5/2
3*x = -(y-5/2) // : 3
x = (-(y-5/2))/3
x = (5/2-y)/3
x = (5/2-y)/3
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