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x in (-oo:+oo)
(5*x)/3-(2/5) = 0
(5*x)/3-2/5 = 0
5/3*x-2/5 = 0 // + 2/5
5/3*x = 2/5 // : 5/3
x = 2/5/5/3
x = 6/25
x = 6/25
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