Solve 2x + 6 = 36

The solution of 2x + 6 = 36 is x = 15.

2x + 6 = 36\ \Rightarrow\ x = 15

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The lines y = 2x + 6 and y = 36 meet at x = 15. 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 addition, then the multiplication.
$2x + 6 = 36$
2
Subtract 6 from both sides:
$2x + 6 - 6 = 36 - 6 \ \Rightarrow\ 2x = 30$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{30}{2} \ \Rightarrow\ x = 15$
4
Check: put x = 15 back into the equation.
$2\cdot15 + 6 = 30 + 6 = 36 \checkmark$

LaTeX source of the formulas on this page

\[ 2x + 6 = 36\ \Rightarrow\ x = 15 \]
\[ 2x + 6 = 36 \]
\[ 2x + 6 - 6 = 36 - 6 \ \Rightarrow\ 2x = 30 \]
\[ \frac{2x}{2} = \frac{30}{2} \ \Rightarrow\ x = 15 \]
\[ 2\cdot15 + 6 = 30 + 6 = 36 \checkmark \]

Trying values of x in 2x + 6 = 36

x	2x + 6	Equals 36?
13	32	no
14	34	no
15	36	yes
16	38	no
17	40	no

Questions

What is x in 2x + 6 = 36?

The solution of 2x + 6 = 36 is x = 15.

How do you solve 2x + 6 = 36?

Subtract 6 from both sides to get 2x = 30, then divide both sides by 2 to get x = 15.

How do I check the answer?

Replace x by 15: 2(15) + 6 = 36, which is 36.

Solve 2x + 6 = 36

How to work it out

Trying values of x in 2x + 6 = 36

Questions

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