Chapter 2.5, Problem 18E

To determine

To find: The solution of equation $n-72=72$ and check the solution

Answer to Problem 18E

The solution of equation is $n=144$

Explanation of Solution

Given information: $\text{Consider the expression provide in the question}$

  $n-72=72$

Calculation:

To evaluate the expression, it is needed to add $\text{72}$ in both sides of equation

  $n-72=72$

  $\begin{array}{l}\Rightarrow n-72+72=72+72\\ \Rightarrow n=144\end{array}$

Check:

Put $n=144$ in the given equation

  $\begin{array}{l}\Rightarrow 144-72=72\\ \Rightarrow 72=72\end{array}$

Therefore, Left hand side = Right hand side

Hence,

The solution of equation is $n=144$