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x in (-oo:+oo)
(2/5)*x-y = 13 // - 13
(2/5)*x-y-13 = 0
2/5*x-y-13 = 0 // + -y-13
2/5*x = -(-y-13) // : 2/5
x = (-(-y-13))/2/5
x = 5/2*(y+13)
x = 5/2*(y+13)
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