Answer:
I want to say the answer is b
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Step-by-step explanation:
The best method I know is elimination, i explained it in the chat in the prev question. It's applicable in any scenario.
 
        
             
        
        
        
Step-by-step explanation:
We need to solve each equation.
a. 6c = 30
c = 30/6 = 5
b.
2d-6=12
Adding 6 both sides
 2d-6+6=12+6
2d = 18
d = 9
c.

d.
50=14+3m
50-14=3m
36=3m
m = 12
Hence, this is the required solution.