VII. $$ 8 x+6=54 $$ VIII. $$ 9 x-5=50 $$ IX. $$ 10 x+7=77 $$ X. $$ 11 x-8=63 $$

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### VII. $$ 8x + 6 = 54 $$

**解答过程：**
1. $$ 8x + 6 = 54 $$
2. 减去6两边：
   $$ 8x = 54 - 6 $$
   $$ 8x = 48 $$
3. 除以8两边：
   $$ x = \frac{48}{8} $$
   $$ x = 6 $$

**答案：**
$$ x = 6 $$

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### VIII. $$ 9x - 5 = 50 $$

**解答过程：**
1. $$ 9x - 5 = 50 $$
2. 加上5两边：
   $$ 9x = 50 + 5 $$
   $$ 9x = 55 $$
3. 除以9两边：
   $$ x = \frac{55}{9} $$
   $$ x \approx 6.11 $$

**答案：**
$$ x = \frac{55}{9} \approx 6.11 $$

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### IX. $$ 10x + 7 = 77 $$

**解答过程：**
1. $$ 10x + 7 = 77 $$
2. 减去7两边：
   $$ 10x = 77 - 7 $$
   $$ 10x = 70 $$
3. 除以10两边：
   $$ x = \frac{70}{10} $$
   $$ x = 7 $$

**答案：**
$$ x = 7 $$

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### X. $$ 11x - 8 = 63 $$

**解答过程：**
1. $$ 11x - 8 = 63 $$
2. 加上8两边：
   $$ 11x = 63 + 8 $$
   $$ 11x = 71 $$
3. 除以11两边：
   $$ x = \frac{71}{11} $$
   $$ x \approx 6.45 $$

**答案：**
$$ x = \frac{71}{11} \approx 6.45 $$
### VII. $$ 8x + 6 = 54 $$ $$ x = 6 $$ ### VIII. $$ 9x - 5 = 50 $$ $$ x = \frac{55}{9} \approx 6.11 $$ ### IX. $$ 10x + 7 = 77 $$ $$ x = 7 $$ ### X. $$ 11x - 8 = 63 $$ $$ x = \frac{71}{11} \approx 6.45 $$

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