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9-(x/3) = 13/2 // - 13/2
9-(x/3)-(13/2) = 0
9-(x/3)-13/2 = 0
5/2-1/3*x = 0 // - 5/2
-1/3*x = -5/2 // : -1/3
x = -5/2/(-1/3)
x = 15/2
x = 15/2
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