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