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x in (-oo:+oo)
(1/5)*x-(1/3) = 8/3 // - 8/3
(1/5)*x-(1/3)-(8/3) = 0
(1/5)*x-1/3-8/3 = 0
1/5*x-3 = 0 // + 3
1/5*x = 3 // : 1/5
x = 3/1/5
x = 15
x = 15
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