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x in (-oo:+oo)
(5/2)*x-y = 4 // - 4
(5/2)*x-y-4 = 0
5/2*x-y-4 = 0 // + -y-4
5/2*x = -(-y-4) // : 5/2
x = (-(-y-4))/5/2
x = 2/5*(y+4)
x = 2/5*(y+4)
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