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12/9-(3*x) = 3 // - 3
12/9-(3*x)-3 = 0
12/9-3*x-3 = 0
-3*x-5/3 = 0 // + 5/3
-3*x = 5/3 // : -3
x = 5/3/(-3)
x = -5/9
x = -5/9
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