Expressions/Equations Practice

 $2x^2+3+3x-1-x^2$  

 $2x+3x+9+x$  

 $3x+4y+x-2y$  

 $5a+6-2a-1$  

 $3x+4\left(x+4\right)-9$  

 $-2x+6=18$  

 $\frac{r}{6}-14=0$  

 $7-9x=88$  

 $2\left(x+3\right)=16$  

 $\frac{1}{4}\left(y+8\right)=20$