Answer
q = 20
Explanation
Given equation:
[tex]4(q-15)=20[/tex]The first step in finding q is open the parenthesis:
[tex]\begin{gathered} 4\times q-4\times15=20 \\ 4q-60=20 \end{gathered}[/tex]Add 60 to both sides of the equation:
[tex]\begin{gathered} 4q-60+60=20+60 \\ 4q=80 \end{gathered}[/tex]Finally, divide both sides by 4 to get q:
[tex]\begin{gathered} \frac{4q}{4}=\frac{80}{4} \\ q=20 \end{gathered}[/tex]