A good answer might be:

 a + b + c = 0
 a + b = -c

 ( 4,  5 )^T  = -( c₀, c₁ )^T
-( 4,  5 )^T  =  ( c₀, c₁ )^T
 (-4, -5 )^T  =  ( c₀, c₁ )^T

 c₀ = -4
 c₁ = -5

End of the Chapter

Here are some of the topics this chapter covered:

Transpose of a column or row matrix.
Addition of column and row matrices.
Commutative property of matrix addition.
Associative property of matrix addition.
Subtraction of column and row matrices.
Non-commutative property of matrix subtraction.

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