Difficulty 1: in one-step equation, when there are unknowns in subtraction and divisor, we must first find the reciprocal of the part containing the unknowns; Difficulty 2: In the two-step equation, when the unknown appears in subtraction and divisor, the part containing the unknown is regarded as a whole first, and this whole is regarded as a new unknown, which is equivalent to simplifying one step; Difficulty 3: in the three-step equation, we should combine the law of multiplication and distribution, simplify it into a two-step equation, then simplify it into a one-step equation, and finally we can easily solve it. Solving equation problems is not as difficult as you think. As long as you master the method, it is entirely possible to get full marks in this sub-topic.