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x in (-oo:+oo)
(5/8)*x-(1/2) = 1/5 // - 1/5
(5/8)*x-(1/2)-(1/5) = 0
(5/8)*x-1/2-1/5 = 0
5/8*x-7/10 = 0 // + 7/10
5/8*x = 7/10 // : 5/8
x = 7/10/5/8
x = 28/25
x = 28/25
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