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It is not possible to evaluate the expression because there is no operator between 6.02 and 1.3
Cramer's rule makes it possible to evaluate a determinant without getting confused and making mistakes.
It is a group of numbers without any operators separating them. It is therefore not possible to evaluate them as if they formed a numerical expression.
To evaluate it you need to know both b and a. But it is possible to factorise it as follows: b2-a2 = (b-a)*(b+a)
The value of this expression depends on the values of x and of y. Since you have not bothered to share that information, it is not possible to evaluate the expression.