Answer:
x= 29
Step-by-step explanation:
Since, ∆ABC is congruent to ∆DEF,
AB= DE....(i)
BC= EF....(ii)
AC= DF....(iii)
From (ii), BC= EF,
So, 3x-7 = 20
3x= 20+7= 27
x= 27/3 = 9
Hope it helps you
