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x in (-oo:+oo)
4 = (5/3)*x // - (5/3)*x
4-((5/3)*x) = 0
(-5/3)*x+4 = 0
4-5/3*x = 0 // - 4
-5/3*x = -4 // : -5/3
x = -4/(-5/3)
x = 12/5
x = 12/5
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