Solve 2x + 5 = 25

The solution of 2x + 5 = 25 is x = 10.

2x + 5 = 25\ \Rightarrow\ x = 10

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The lines y = 2x + 5 and y = 25 meet at x = 10. 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.
$2x + 5 = 25$
2
Subtract 5 from both sides:
$2x + 5 - 5 = 25 - 5 \ \Rightarrow\ 2x = 20$
3
Divide both sides by 2:
$\frac{2x}{2} = \frac{20}{2} \ \Rightarrow\ x = 10$
4
Check: put x = 10 back into the equation.
$2\cdot10 + 5 = 20 + 5 = 25 \checkmark$

LaTeX source of the formulas on this page

\[ 2x + 5 = 25\ \Rightarrow\ x = 10 \]
\[ 2x + 5 = 25 \]
\[ 2x + 5 - 5 = 25 - 5 \ \Rightarrow\ 2x = 20 \]
\[ \frac{2x}{2} = \frac{20}{2} \ \Rightarrow\ x = 10 \]
\[ 2\cdot10 + 5 = 20 + 5 = 25 \checkmark \]

Trying values of x in 2x + 5 = 25

x	2x + 5	Equals 25?
8	21	no
9	23	no
10	25	yes
11	27	no
12	29	no

Questions

What is x in 2x + 5 = 25?

The solution of 2x + 5 = 25 is x = 10.

How do you solve 2x + 5 = 25?

Subtract 5 from both sides to get 2x = 20, then divide both sides by 2 to get x = 10.

How do I check the answer?

Replace x by 10: 2(10) + 5 = 25, which is 25.

Solve 2x + 5 = 25

How to work it out

Trying values of x in 2x + 5 = 25

Questions

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