13/5 功課1: 簡易方程(一)A    
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解下面的方程，求下列各未知數的數值。(只需直接輸入未知數的答案)
解方程的步驟及驗算，請另寫於草稿紙上。
1. 9k + 54 = 81 *
1 point
2. 42 + 7n = 56 *
1 point
3. 65 + 2a = 121 *
1 point
4. 4r + 12 = 20 *
1 point
5. 9j + 26 = 62 *
1 point
6. 4n + 6  = 38 *
1 point
7. 4p + 5 = 29 *
1 point
8. 10 + 8d  = 90 *
1 point
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