2-5

 $15\left(20+d\right)=420$  

 $-3\left(9+x\right)=33$  

 $5\left(x-7\right)=25$  

 $5\left(x-3\right)+2x=41$  

 $-3\left(4x-6\right)=54$  

 $3\left(a-2\right)=2\left(3a-3\right)$ 

2x -6 = 2x - 6

• 0

• null or no solution

• all numbers work

2x -6 = 2x - 12

• 0

• null or no solution

• all numbers work

2x -5 = 7x