Solve 3x + 5 = 23
The solution of 3x + 5 = 23 is x = 6.
How to work it out
- 1
The goal is to get x alone. Undo the operations in the opposite order: first the addition, then the multiplication.
- 2
Subtract 5 from both sides:
- 3
Divide both sides by 3:
- 4
Check: put x = 6 back into the equation.
LaTeX source of the formulas on this page
\[ 3x + 5 = 23\ \Rightarrow\ x = 6 \]
\[ 3x + 5 = 23 \]
\[ 3x + 5 - 5 = 23 - 5 \ \Rightarrow\ 3x = 18 \]
\[ \frac{3x}{3} = \frac{18}{3} \ \Rightarrow\ x = 6 \]
\[ 3\cdot6 + 5 = 18 + 5 = 23 \checkmark \]Trying values of x in 3x + 5 = 23
| x | 3x + 5 | Equals 23? |
|---|---|---|
| 4 | 17 | no |
| 5 | 20 | no |
| 6 | 23 | yes |
| 7 | 26 | no |
| 8 | 29 | no |
Questions
What is x in 3x + 5 = 23?
The solution of 3x + 5 = 23 is x = 6.
How do you solve 3x + 5 = 23?
Subtract 5 from both sides to get 3x = 18, then divide both sides by 3 to get x = 6.
How do I check the answer?
Replace x by 6: 3(6) + 5 = 23, which is 23.