Solve an equation with two unknown variables

How i can solve this equation in matlab , z = x+y / avg
where x = 4 , y = 6 ? How we can solve if two unknown variables in matlab ?!

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Are you asking how to solve for BOTH z and avg, if only x and y are known? That is impossible. It is not MATLAB that is the problem however, but just mathematics.
In general, it is impossible to find a solution of one equation where you have two unknowns. At best, you can solve for one unknown, as a function of the other. Again, just mathematics here. Don't blame MATLAB for not giving you a way to do the mathematically impossible.

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