Under normal circumstances (that is, the general mid-term exam, monthly exam and unit exam in our school), you will be deducted, and there will be no points left (the teacher may leave you 2 or 3 points with kindness)! If it is a unified exam or a joint exam, he will give you a certain step score and have a strict scoring model. Usually the result of the last step is miscalculated, and only 2 points are deducted. If only the correct equations are listed, only 2-3 points will be deducted. If most steps are correct, you will generally get 6-8 points!

By the way! Now that I have passed the exam, there is nothing I can do. If it is a joint exam, you must not care, otherwise it will affect the mood of other subjects in the exam, and maybe the exam will be worse!