What is the current equation and approach for problem-solving?

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BARBARlAN
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Circuit schematic with three loops: a 5.7 Ω resistor carrying current i3 next to a 2.4 V battery in the top branch, a 1.4 Ω resistor carrying i2 and a 2.6 V battery in the middle, and a 2.5 Ω resistor, 2.6 V battery, 1.4 Ω resistor carrying i1, and 7.7 V battery in the bottom loop, with the prompt 'determine i1' in answer units of A.
 

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Please show relevant equations and an attempt, or at the very least, explain what you have already tried. We can't offer help if there's nothing to critique.
 

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