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Sagot :

Suppose that we defined an operation as ⊕; then, we can be defined the commutative property as shown below

[tex]x\oplus y=y\oplus x[/tex]

This is called the 'commutative property of the operation ⊕'.

In our case, ⊕ is replaced by +, x for 15x, and y for 9; therefore,

[tex]\Rightarrow15x+9=9+15x[/tex]

This is the 'commutative property of the addition'.