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