91Ó°ÊÓ

We have an equation $14+x=21$and a set$x:\left\{1,3,5,7,9\right\}$

To find the solution of the given equation at every value of $x$.

We substitute the values of $x$in the given equation one by one and check which value of $x$makes both the sides of the equation equal.

Which value of $x$makes both the sides of the equation that is called the solution of the given equation.

Substitute $x=1$in the equation$14+x=21$

$$\begin{gathered} 14+1=21 \\ ⇒15≠21 \end{gathered}$$

$x=1$is not solution

Substitute $x=3$in the equation$14+x=21$

$$\begin{gathered} 14+3=21 \\ ⇒17≠21 \end{gathered}$$

$x=3$is not solution

Substitute $x=5$in the equation$14+x=21$

$$\begin{gathered} 14+5=21 \\ ⇒19≠21 \end{gathered}$$

$x=5$is not solution

Substitute $x=9$in the equation$14+x=21$

$$\begin{gathered} 14+9=21 \\ ⇒23≠21 \end{gathered}$$

$x=9$is not solution

Substitute $x=7$in the equation$14+x=21$

$$\begin{gathered} 14+7=21 \\ ⇒21=21 \end{gathered}$$

Hence, the$x=7$ is the solution of the given equation.