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if 4A+ 5B + 9C = 36 and 7A + 9B + 17C = ...

if 4A+ 5B + 9C = 36 and 7A + 9B + 17C = 66 then, find A+B+C.

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  3. if 4A+ 5B + 9C = 36 and 7A + 9B + 17C = 66 then, find A+B+C.

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