$\"\"$

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

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First write the dimension of the matrix.

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

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The operation is possible. $\"\"$

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Multiply the matrix by $\"\"$ 4.

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$\"\"$

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$\"\"$ (Multiply each element by $\"\"$ 4)

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

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Multiply the matrix by 3.

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$\"\"$

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$\"\"$ (Multiply each element by 3)

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

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Multiply the matrix by 5

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$\"\"$

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

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

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Perform the operation

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$\"\"$

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

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$\"\"$ (Apply commutative property of addition: a + b = b + a)

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

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The value of is $\"\"$ .