The circuit shown in the figure has resistors R1 = 10 Ω, R2 = 20 Ω, R3 = 30 Ω, ε1 = 10 V, ε2 = 20 V. What is the current through resistor R1?
(1) 1 A
(2) 2 A
(3) 1.5 A
(4) 0.5 A
(5) 0.67 A
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