Solve 9x − 3 = 168

The solution of 9x − 3 = 168 is x = 19.

9x - 3 = 168\ \Rightarrow\ x = 19

Explain it step by step in chat Make a short video of it

The lines y = 9x − 3 and y = 168 meet at x = 19. The solution of the equation is the x-coordinate of the point where the two sides are equal.

How to work it out

1
The goal is to get x alone. Undo the operations in the opposite order: first the subtraction, then the multiplication.
$9x - 3 = 168$
2
Add 3 to both sides:
$9x - 3 + 3 = 168 + 3 \ \Rightarrow\ 9x = 171$
3
Divide both sides by 9:
$\frac{9x}{9} = \frac{171}{9} \ \Rightarrow\ x = 19$
4
Check: put x = 19 back into the equation.
$9\cdot19 - 3 = 171 - 3 = 168 \checkmark$

LaTeX source of the formulas on this page

\[ 9x - 3 = 168\ \Rightarrow\ x = 19 \]
\[ 9x - 3 = 168 \]
\[ 9x - 3 + 3 = 168 + 3 \ \Rightarrow\ 9x = 171 \]
\[ \frac{9x}{9} = \frac{171}{9} \ \Rightarrow\ x = 19 \]
\[ 9\cdot19 - 3 = 171 - 3 = 168 \checkmark \]

Trying values of x in 9x − 3 = 168

x	9x − 3	Equals 168?
17	150	no
18	159	no
19	168	yes
20	177	no
21	186	no

Questions

What is x in 9x − 3 = 168?

The solution of 9x − 3 = 168 is x = 19.

How do you solve 9x − 3 = 168?

Add 3 to both sides to get 9x = 171, then divide both sides by 9 to get x = 19.

How do I check the answer?

Replace x by 19: 9(19) − 3 = 168, which is 168.

Solve 9x − 3 = 168

How to work it out

Trying values of x in 9x − 3 = 168

Questions

Similar equations