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x in (-oo:+oo)
5*x-((4*x)/3) = 4*x // - 4*x
5*x-((4*x)/3)-(4*x) = 0
5*x+(-4/3)*x-4*x = 0
-1/3*x = 0 // : -1/3
x = 0
x = 0
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