[tex] Nilai \: x \\ \frac{(17 \times 10) - (15 + 16 + 17 + 18 + 19 + 20 + 21 + 23)}{3} \\ \\ \frac{(170 -149) }{3} \\ \\ \frac{21}{3} \\ \\ 7[/tex]
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[tex] Nilai \: x \\ \frac{(17 \times 10) - (15 + 16 + 17 + 18 + 19 + 20 + 21 + 23)}{3} \\ \\ \frac{(170 -149) }{3} \\ \\ \frac{21}{3} \\ \\ 7[/tex]