Chapter 1.2, Problem 39E

To determine

To Find: The justification for the step of the solution.

Answer to Problem 39E

The justification for the step of the solution is explained.

Explanation of Solution

Given:

The given equation is,

  $\begin{array}{l}2\left(x+3\right)+x=-9\\ 2\left(x\right)+2\left(3\right)=-9\\ 2x+6+x=-9\\ 3x+6=-9\end{array}$

Solution further is,

  $\begin{array}{l}3x=-15\\ x=-5\end{array}$

Calculation:

In the first step write the equation.

Open the bracket.

Multiply the terms.

Add the common terms of $x$ .

Add both the sides of the equation $-6$ .

Divide both the sides by $3$ .