1. 2X + 3×0.9 = 24.7
改写后：2x + 2.7 = 24.7
Solution: 2x = 24.7 - 2.7
x = 22 / 2
x = 11
2. 12x + 34x = 123
改写后：12x + 34x = 123
Solution: 46x = 123
x = 123 / 46
x = 2.65217391304
3. x - 14x = 22 - 14x = 12
改写后：x - 14x = 22
-13x = 22
x = 22 / -13
x = -2
4. 22 - 14x = 12
改写后：22 - 14x = 12
Solution: -14x = 12 - 22
-14x = -10
x = -10 / -14
x = 5 / 7
5. 1/3x + 5/6x = 1.4
改写后：1/3x + 5/6x = 1.4
Solution: (2x + 5x) / 6 = 1.4
7x / 6 = 1.4
x = 1.4 * 6 / 7
x = 1.2
6. (x - 2) + 2 = x + 120%
改写后：(x - 2) + 2 = x + 1.2
Solution: x - 2 + 2 = x + 1.2
x = x + 1.2 - 2
x = x - 0.8
7. 2(x - 2) + 2 = x + 1
改写后：2(x - 2) + 2 = x + 1
Solution: 2x - 4 + 2 = x + 1
2x - x = 1 - 2 + 4
x = 3
8. (1 - 20%)(320 - x) = 320×40%
改写后：(1 - 0.20)(320 - x) = 320×0.40
Solution: 0.80(320 - x) = 128
320 - x = 128 / 0.80
x = 320 - 160
x = 160
请注意，以上解答中，我已纠正了原文中的错误，并提供了正确的方程解答。
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