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The idea is to work with the same variables, but it is possible that some of the variables are missing in some of the equations.
One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.One linear equation in two variable cannot be solved. It is possible to express either of the two variables in terms of the other but a solution is not possible.
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You can do all the calculations with variables - add the numbers, and divide by the size of the set. Of course, you'll probably end up having variables in the average as well.