How much current flows through R3 How much potentials across

How much current flows through R_3? How much potentials across R_7?

Here ,

R1 and R2 are in parallel

1/R4 = 1/10 + 1/15

R4 = 6 Ohm

R4 and R4 in series

R5 = 7 + 6 = 13 Ohm

for R2 and R5 in parallel

1/R8 = 1/13 + 1/20

R8 = 7.87 Ohm

Req = 7.87 + 10

Req = 17.87 Ohm

I = 9/17.87 = 0.5033 A

I7 = 20 * 0.5033/(20 + 13)

I7 = 0.305 A

potential across R7 = 0.305 * 7 = 2.14 V

current through R3 = 0.305 * 10/(10 + 15)

current through R3 = 0.122 A

the current through R3 is 0.122 A