[tex]x + \frac{x}{3} + 2(x + 7) = 154 \\ \\ x + \frac{x}{3} + 2x + 14 = 154 \\ \\ 3x + \frac{x}{3} = 140 | \times 3 \\ \\ 9x + x = 420 \\ \\ 10x = 420 \\ \\ x = 42 \\ [/tex]
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[tex]x + \frac{x}{3} + 2(x + 7) = 154 \\ \\ x + \frac{x}{3} + 2x + 14 = 154 \\ \\ 3x + \frac{x}{3} = 140 | \times 3 \\ \\ 9x + x = 420 \\ \\ 10x = 420 \\ \\ x = 42 \\ [/tex]