I GOT IT. Sorry to bother you. For (2), (5a-3b)/a=-(4a+b-2c)/-(a+4b-2c)=(a+2b-3c... [multiplying by -1 both num. and deno. of 2nd ratio] and now by addendo, we get each ratio = (2a-2b-c)/(4a-4b-2c) = 1/2. The rest is easy.
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