Question: Solve equation with matrix arguments

I have an equation to solve 

mu*f = (2*S1*f + S1*x)

where mu is scalar, f is vector, x is vector, S1 is a matrix. I need to solve this equation for f but S1 is matrix sow can I tell Maple that S1 is matrix? If we solve the equation with matrix we need to use matrices inverse. If we have to divide by matrix we use the product of the inverse of this matrix.

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