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简化 4x + -5(x + 2) = 1 重新排序条件: 4x + -5(2 + x) = 1 4x + (2 * -5 + x * -5) = 1 4x + (-10 + -5x) = 1 重新排序条件: -10 + 4x + -5x = 1 结合相似条件: 4x + -5x = -1x -10 + -1x = 1 解: -10 + -1x = 1 求解变量 'x'. 移动所有含x 的放右边,所有其它条件放左边. 增加 '10' 到方程的每一侧. -10 + 10 + -1x = 1 + 10 结合相似条件: -10 + 10 = 0 0 + -1x = 1 + 10 -1x = 1 + 10 结合相似条件: 1 + 10 = 11 -1x = 11 两边除以 '-1'. x = -11 简化 x = -11
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