How can i give difference to number by '
And i will use it in next calculation.
But error message appeared
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You haven't shown your error (or the code that generates it), so I have to guess what you are doing, but you cannot include non-alphanumeric characters other than underscores in the names of variables.
In any case, to solve a linear system of equations, you wouldn't define different variables. You would write the equations in matrix-vector form
and solve via
This is MATLAB, after all!