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x in (-oo:+oo)
4/3-5*x = 8/3 // - 8/3
4/3-5*x-(8/3) = 0
4/3-5*x-8/3 = 0
-5*x-4/3 = 0 // + 4/3
-5*x = 4/3 // : -5
x = 4/3/(-5)
x = -4/15
x = -4/15
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