Solve 5x + 5 = 65
The solution of 5x + 5 = 65 is x = 12.
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 5:
- 4
Check: put x = 12 back into the equation.
LaTeX source of the formulas on this page
\[ 5x + 5 = 65\ \Rightarrow\ x = 12 \]
\[ 5x + 5 = 65 \]
\[ 5x + 5 - 5 = 65 - 5 \ \Rightarrow\ 5x = 60 \]
\[ \frac{5x}{5} = \frac{60}{5} \ \Rightarrow\ x = 12 \]
\[ 5\cdot12 + 5 = 60 + 5 = 65 \checkmark \]Trying values of x in 5x + 5 = 65
| x | 5x + 5 | Equals 65? |
|---|---|---|
| 10 | 55 | no |
| 11 | 60 | no |
| 12 | 65 | yes |
| 13 | 70 | no |
| 14 | 75 | no |
Questions
What is x in 5x + 5 = 65?
The solution of 5x + 5 = 65 is x = 12.
How do you solve 5x + 5 = 65?
Subtract 5 from both sides to get 5x = 60, then divide both sides by 5 to get x = 12.
How do I check the answer?
Replace x by 12: 5(12) + 5 = 65, which is 65.