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x in (-oo:+oo)
(4/3)*x-((2/3)*x)+9 = 11 // - 11
(4/3)*x-((2/3)*x)-11+9 = 0
(4/3)*x+(-2/3)*x-11+9 = 0
2/3*x-2 = 0 // + 2
2/3*x = 2 // : 2/3
x = 2/2/3
x = 3
x = 3
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