Question

What is the value of x if 3x - 6 = 21 ?

Answer 1

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.

Answer 2

Answer:

x = 9

Step-by-step explanation:

$3x-6=21\qquad\text{add 6 to both sides}\\\\3x-6+6=21+6\\\\3x=27\qquad\text{divide both sides by 3}\\\\\dfrac{3x}{3}=\dfrac{27}{3}\\\\x=9$