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x in (-oo:+oo)
1/3-5*x = 8/3 // - 8/3
1/3-5*x-(8/3) = 0
1/3-5*x-8/3 = 0
-5*x-7/3 = 0 // + 7/3
-5*x = 7/3 // : -5
x = 7/3/(-5)
x = -7/15
x = -7/15
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