if A-B=2C,A+B=4C and C=3i+4j, then what are A and B?

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please guyz i need your help, i don't know where to start this question.
Let me try and solve this then help you okay?
Well honestly I can't figure it out. Sorry. There's just too many possible answers here.
jika a-b=2c, a+b=4c dan c=3i+4j, maka a dan b adalah
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