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简化 5X + 3(4x + 14) = -111 重新排序条件: 5X + 3(14 + 4x) = -111 5X + (14 * 3 + 4x * 3) = -111 5X + (42 + 12x) = -111 重新排序条件: 42 + 5X + 12x = -111 解: 42 + 5X + 12x = -111 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 '-42' 到方程的每一侧. 42 + 5X + -42 + 12x = -111 + -42 重新排序条件: 42 + -42 + 5X + 12x = -111 + -42 结合相似条件: 42 + -42 = 0 0 + 5X + 12x = -111 + -42 5X + 12x = -111 + -42 结合相似条件: -111 + -42 = -153 5X + 12x = -153 增加 '-12x' 到方程的每一侧. 5X + 12x + -12x = -153 + -12x 结合相似条件: 12x + -12x = 0 5X + 0 = -153 + -12x 5X = -153 + -12x 两边除以 '5'. X = -30.6 + -2.4x 简化 X = -30.6 + -2.4x
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