Solve the equation using mental math.
x – start fraction 1 over 7 end fraction = 3start fraction 4 over 7 end fraction
A. 2start fraction 5 over 7 end fraction
B. 3start fraction 3 over 7 end fraction
C. 3start fraction 5 over 7 end fraction
D. 3start fraction 4 over 7 end fraction