Question

Solve the equation. Check your solution.

$x+8=21$

Short answer

Solution of given equation is$x=13$

Step-by-step solution

Step 1.  Solving for value of x

$x+8=21$

Subtracting $8$on both sides give

$\begin{array}{c}x+8-8=21-8\\ x=21-8\\ x=13\end{array}$

So, the solution is $x=13$.

Step 2. Verification of solution

For checking our answer, substitute $x=13$in given equation$x+8=21$.

On substituting, we get,

$\begin{array}{c}x+8=21\\ 13+8=21\\ 21=21\end{array}$

Step 3.  Conclusion

Here, as both sides above expression are equal, the answer is true.