Question

When u solve an equation you must do the same thing to both sides of the equal sign

Answer 1

According to the properties of equality,

`\begin{gathered} a=b \\ \Rightarrow a\cdot c=b\cdot c \end{gathered}`

In our case,

`\begin{gathered} (x)/(3)=5 \\ \Rightarrow3\cdot(x)/(3)=3\cdot5 \\ \Rightarrow3\cdot(x)/(3)=5\cdot3 \end{gathered}`

Therefore, the missing number is 3.