$\"\"$

For adding and subtracting matrices, their dimension should be equal.

First write the dimension of the matrix.

The dimensions of matrix are $\"\"$ .

The operation is possible. $\"\"$

Multiply the matrix by 5.

$\"\"$

$\"\"$ (Multiply each element by 5)

$\"\"$ (Simplify) $\"\"$

Multiply the matrix by 6.

$\"\"$

$\"\"$ (Multiply each element by 6)

$\"\"$ (Simplify) $\"\"$

Multiply the matrix by -2

$\"\"$

$\"\"$ (Multiply each element by -2) $\"\"$

Perform the operation

$\"\"$

$\"\"$ (Add and Subtract the elements)

$\"\"$ (Simplify) $\"\"$

The value of is $\"\"$ .