2. Remove the brackets: first remove the brackets, then remove the brackets, and finally remove the braces; (If there is a minus sign outside the brackets, please remember to change the sign.)
3. Move the term: move all terms containing unknowns to one side of the equation, and all other terms to the other side of the equation; Move the item to change the symbol.
4. Merge similar terms: transform the equation into ax=b(a≠0);
5. Convert the coefficient into 1: Divide the unknown coefficient A on both sides of the equation to get the solution of the equation X = b/a. 。