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x in (-oo:+oo)
(5/8)*x-(2/5) = 3 // - 3
(5/8)*x-(2/5)-3 = 0
(5/8)*x-2/5-3 = 0
5/8*x-17/5 = 0 // + 17/5
5/8*x = 17/5 // : 5/8
x = 17/5/5/8
x = 136/25
x = 136/25
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