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x in (-oo:+oo)
(5/3)*x = 3/8 // - 3/8
(5/3)*x-(3/8) = 0
(5/3)*x-3/8 = 0
5/3*x-3/8 = 0 // + 3/8
5/3*x = 3/8 // : 5/3
x = 3/8/5/3
x = 9/40
x = 9/40
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