$2\left( k+5 \right)=25$
Distribute $2$ through the parentheses$2k+10=25$
Move the constant to the right-hand side and change its sign$2k=25-10$
Subtract the numbers$2k=15$
Divide both sides of the equation by $2$$\begin{align*}&k=\frac{ 15 }{ 2 } \\&\begin{array} { l }k=7 \frac{ 1 }{ 2 },& k=7.5\end{array}\end{align*}$