How Do You Solve For E And How Do You Solve For A ...EF/D=AC/D?

Question

Can You Please Explain The Way To Do Them...Thank You

Answer 1

for E:
EF/D= AC/D
single out the E by multiplying the recipricol:
(D/F)(EF/D)=(AC/D)(D/F)
simplify:
E=ACF
same thing for A

Answer 2

EF = ACD/D = AC
E =AC/F
A = EF/C
Just move them around (multiply both sides by 1 where 1 = D/D, etc.)