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x in (-oo:+oo)
8/3 = x/5 // - x/5
8/3-(x/5) = 0
8/3-1/5*x = 0 // - 8/3
-1/5*x = -8/3 // : -1/5
x = -8/3/(-1/5)
x = 40/3
x = 40/3
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