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x in (-oo:+oo)
9-x/3-((2*x)/3) = -2 // + 2
2-x/3-((2*x)/3)+9 = 0
(-2/3)*x-x/3+2+9 = 0
11-x = 0 // - 11
-x = -11 // * -1
x = 11
x = 11
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