Solve 5x + 5 = 105
The solution of 5x + 5 = 105 is x = 20.
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 = 20 back into the equation.
LaTeX source of the formulas on this page
\[ 5x + 5 = 105\ \Rightarrow\ x = 20 \]
\[ 5x + 5 = 105 \]
\[ 5x + 5 - 5 = 105 - 5 \ \Rightarrow\ 5x = 100 \]
\[ \frac{5x}{5} = \frac{100}{5} \ \Rightarrow\ x = 20 \]
\[ 5\cdot20 + 5 = 100 + 5 = 105 \checkmark \]Trying values of x in 5x + 5 = 105
| x | 5x + 5 | Equals 105? |
|---|---|---|
| 18 | 95 | no |
| 19 | 100 | no |
| 20 | 105 | yes |
| 21 | 110 | no |
| 22 | 115 | no |
Questions
What is x in 5x + 5 = 105?
The solution of 5x + 5 = 105 is x = 20.
How do you solve 5x + 5 = 105?
Subtract 5 from both sides to get 5x = 100, then divide both sides by 5 to get x = 20.
How do I check the answer?
Replace x by 20: 5(20) + 5 = 105, which is 105.