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-((2/3)*x)-9 = -28/3 // + -28/3
-((2/3)*x)-(-28/3)-9 = 0
(-2/3)*x+28/3-9 = 0
1/3-2/3*x = 0 // - 1/3
-2/3*x = -1/3 // : -2/3
x = -1/3/(-2/3)
x = 1/2
x = 1/2
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