Their equivalent resistance is $R_1 = 4Ω + 3Ω = 7Ω$.
The resistors 3Ω and 4Ω are in series at the bottom. Their equivalent resistance is $R_2 = 3Ω + 4Ω = 7Ω$.
The resistors 6Ω and 4Ω are in parallel. Their equivalent resistance is $R_3 = \frac{6Ω \times 4Ω}{6Ω +
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