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The first step is to know exactly why you're angry. You can't deal with a problem when you don't know what it is. At this point, you need to be honest with yourself. Sometimes, we are embarrassed by the real reason we're angry and try to cover it with something else. Don't do that. Be honest with yourself and your feelings
The next step is to decide what would make you calm down. Be realistic and don't try to use this opportunity to oppress others. Sometimes simply telling the other party would help. Or it could be an apology. Or perhaps you need an action to be reversed/carried out.
Next, let the person who made you angry realise he/she is responsible. You don't have to engage in a shouting match or trade accusations. Just state your feelings in a calm way without blame.
This next part is the trickiest. If the person accepts his/her responsibility and apologizes, things usually go on smoothly. If not, you need to make a decision to let it slide.
You should know that no one is worth your personal peace. If after trying to deal with the issue, the other party remains adamant or you just can't get over it, have a little discussion with yourself. Remind yourself that you're in control of your feelings.
At the end, we're all responsible for how we feel. We sometimes simply have to make a decision and stick with it