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x in (-oo:+oo)
2*x = -(6/9)-6 // + -(6/9)-6
2*x+6/9+6 = 0
2*x+20/3 = 0 // - 20/3
2*x = -20/3 // : 2
x = -20/3/2
x = -10/3
x = -10/3
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