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[tex] \frac{x}{3} = 12 - x[/tex]
[tex] \frac{x}{3} = 12 - x[/tex]
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[tex] \frac{x}{3} = 12 - x \\ x = 36 - 3x \\ x + 3x = 36 \\ 4x = 36 \\ x = 9 [/tex]