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x in (-oo:+oo)
5 = x/3-(2*x) // - x/3-(2*x)
2*x-(x/3)+5 = 0
5/3*x+5 = 0 // - 5
5/3*x = -5 // : 5/3
x = -5/5/3
x = -3
x = -3
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