What am I doing wrong? (matrix question)

What am I doing wrong? (matrix question)

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I have a matrix problem where I solve for X, the problem is 4X + A = B. I plugged my matrices into my calculator & typed 4x + a then pressed enter. Then it said error? Am I not doing this problem correctly?

Do I just subtract the 2 matrices from each other instead?

Did you define a and b?

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