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Mixed numbers can be converted to improper fractions. Improper fractions can be added the same way proper fractions are.
okay one step equations are when you do 1 problem and two step is when you do the same procedure twice
Adding like terms can be like adding fractions. You can only add fractions with a common denomonator. You can only combine terms together if they are like. Think of like terms as denomonators. You can only add if they are like.
Linear equations, if they have a solution, can be solved analytically. On the other hand, it may not always be possible to find a solution to nonlinear equations. This is where you use various numerical methods (eg Newton-Raphson) to work from one approximate numerical solution to a better solution. This iterative procedure, if properly applied, gives accurate numerical solutions to nonlinear equations. But as mentioned above, they are not arrived at analytically.
The best way is to divide the answer by one of the fractions. If the answer is the other fraction then you are OK. If not, you've made a mistake somewhere.It is often no good going over the same procedure a second time because you are liable to make the same mistake again.