Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 196: 21

$3(x-5)=108\div12$ $x=8$

$3(x-5)=108\div12$ $\longrightarrow$distributive property $3x-15=108\div12$ $\longrightarrow$divide $3x-15=9$ $\longrightarrow$addition property $3x-15+15=9+15$ $\longrightarrow$simplify $3x=24$ $\longrightarrow$multiplication property $3x\div3=24\div3$ $\longrightarrow$simplify $x=8$