Respuesta :
Answer: The correct answer is 9.
Step-by-step explanation:
Multiplication property of equality is defined as the property in which the a number multiplied on one side of the equation must be multiplied to the other side of the equation with the same sign.
[tex]a\times c=b\times c[/tex]
c is multiplied on both the sides of the reaction.
In the given question:
[tex]21\times x=9\times 21[/tex]
Thus, the value of 'x' will be 9 by associative property.
