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x in (-oo:+oo)
x^1 = 2-(-2/3)-(5*(2/15))-(5*(7/15)) // - 2-(-2/3)-(5*(2/15))-(5*(7/15))
x^1-2/3+5*(2/15)+5*(7/15)-2 = 0
x-2/3+5*(2/15)+5*(7/15)-2 = 0
x+1/3 = 0 // - 1/3
x = -1/3
x = -1/3
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