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x in (-oo:+oo)
(2/5)*x-y = 10 // - 10
(2/5)*x-y-10 = 0
2/5*x-y-10 = 0 // + -y-10
2/5*x = -(-y-10) // : 2/5
x = (-(-y-10))/2/5
x = 5/2*(y+10)
x = 5/2*(y+10)
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