✨ Best Answer ✨
2026共用所以不用看
(5x-9)+(x+2) = (9x-4)+(-x-1) = 7+a
前兩個
6x-7 = 8x-5
x = -1
代回原式
-13 = 7+a
a = -20
✨ Best Answer ✨
2026共用所以不用看
(5x-9)+(x+2) = (9x-4)+(-x-1) = 7+a
前兩個
6x-7 = 8x-5
x = -1
代回原式
-13 = 7+a
a = -20
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