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x in (-oo:+oo)
(2/3)*x = 1/5 // - 1/5
(2/3)*x-(1/5) = 0
(2/3)*x-1/5 = 0
2/3*x-1/5 = 0 // + 1/5
2/3*x = 1/5 // : 2/3
x = 1/5/2/3
x = 3/10
x = 3/10
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