If x=14 which equation is true a. 3(20-x)=44 b. 3(12-x)=6 c. 2(x-3)=22 d. 2x-3=22

To figure the answer out, plug in the number 14 to X. 
Let's try A first
3(20-14)=44
 20 - 14 = 6
3 x 6 ≠ 44 
A is not an option

Now B
3(12-14)=6
12 - 14 = -2
2 x -2 ≠ 6
B is not an option

Now C
2(14-3)=22
14 - 3 = 11
2 x 11 = 22
C is Correct

C is your answer =D