Answer:
Step-by-step explanation:
[tex]3x-6=21\qquad\text{add 6 to both sides}\\\\3x-6+6=21+6\\\\3x=27\qquad\text{divide both sides by 3}\\\\\dfrac{3x}{3}=\dfrac{27}{3}\\\\x=9[/tex]
Hello There!
X=9
If we substitute X in this equation, it would say 3*9 which equals 27 subtract 6 and you get 21 which is true.
