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