if a=5x+11y-15z b=12z-13y+19z c=7x-6y+21z find a=a+b+c b=a-b-c c=a+b-c d=2a+3b+c
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get chef ccffff gc off FCC fvvg fhgggcf fcxffvfxtf6 hyryfyy off
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