Respuesta :

Answer:

x = 28

Step-by-step explanation:

3x - 21 = 63, I am making them equal to each other because of the vertical angle theorem.

3x - 21 = 63, add 21 to both sides

3x = 84, divide 3 to both sides to make x by itself

x = 28  

Answer:

=28

Step-by-step explanation:

(3-21)= 63

3= 63+21

3= 84

= 84:3= 28

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