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x in (-oo:+oo)
8 = (5/3)*x // - (5/3)*x
8-((5/3)*x) = 0
(-5/3)*x+8 = 0
8-5/3*x = 0 // - 8
-5/3*x = -8 // : -5/3
x = -8/(-5/3)
x = 24/5
x = 24/5
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