Solve 2x − 15 = 11

The solution of 2x − 15 = 11 is x = 13.

2x - 15 = 11\ \Rightarrow\ x = 13

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The lines y = 2x − 15 and y = 11 meet at x = 13. 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.
$2x - 15 = 11$
2
Add 15 to both sides:
$2x - 15 + 15 = 11 + 15 \ \Rightarrow\ 2x = 26$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{26}{2} \ \Rightarrow\ x = 13$
4
Check: put x = 13 back into the equation.
$2\cdot13 - 15 = 26 - 15 = 11 \checkmark$

LaTeX source of the formulas on this page

\[ 2x - 15 = 11\ \Rightarrow\ x = 13 \]
\[ 2x - 15 = 11 \]
\[ 2x - 15 + 15 = 11 + 15 \ \Rightarrow\ 2x = 26 \]
\[ \frac{2x}{2} = \frac{26}{2} \ \Rightarrow\ x = 13 \]
\[ 2\cdot13 - 15 = 26 - 15 = 11 \checkmark \]

Trying values of x in 2x − 15 = 11

x	2x − 15	Equals 11?
11	7	no
12	9	no
13	11	yes
14	13	no
15	15	no

Questions

What is x in 2x − 15 = 11?

The solution of 2x − 15 = 11 is x = 13.

How do you solve 2x − 15 = 11?

Add 15 to both sides to get 2x = 26, then divide both sides by 2 to get x = 13.

How do I check the answer?

Replace x by 13: 2(13) − 15 = 11, which is 11.

Solve 2x − 15 = 11

How to work it out

Trying values of x in 2x − 15 = 11

Questions

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