Solve 7x + 9 = 37
The solution of 7x + 9 = 37 is x = 4.
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 9 from both sides:
- 3
Divide both sides by 7:
- 4
Check: put x = 4 back into the equation.
LaTeX source of the formulas on this page
\[ 7x + 9 = 37\ \Rightarrow\ x = 4 \]
\[ 7x + 9 = 37 \]
\[ 7x + 9 - 9 = 37 - 9 \ \Rightarrow\ 7x = 28 \]
\[ \frac{7x}{7} = \frac{28}{7} \ \Rightarrow\ x = 4 \]
\[ 7\cdot4 + 9 = 28 + 9 = 37 \checkmark \]Trying values of x in 7x + 9 = 37
| x | 7x + 9 | Equals 37? |
|---|---|---|
| 2 | 23 | no |
| 3 | 30 | no |
| 4 | 37 | yes |
| 5 | 44 | no |
| 6 | 51 | no |
Questions
What is x in 7x + 9 = 37?
The solution of 7x + 9 = 37 is x = 4.
How do you solve 7x + 9 = 37?
Subtract 9 from both sides to get 7x = 28, then divide both sides by 7 to get x = 4.
How do I check the answer?
Replace x by 4: 7(4) + 9 = 37, which is 37.