$x-15=72$  

(a)  

 $45x=180$  

(a)  

 $42-x=63$  

(a)  

 $\frac{24}{x}=\left(-6\right)$  

(a)  

 $11x-15\ \frac{2}{3}=2\ \frac{3}{5}$  

(a)  

 $4\ \frac{3}{4}x\ +\frac{1}{6}=\frac{1}{4}$  

(a)  

 $16x+404=20$  

(a)  

 $5x+28\ \frac{1}{2}=41$  

(a)  

 $\frac{x}{15}+\frac{3}{5}=7$  

(a)