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sum of 7a-4b+5c, -7a+4b-6c

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Answer to a math question sum of 7a-4b+5c, -7a+4b-6c

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$=7a-4b+5c-7a+4b-6c$

$=7a-7a-4b+4b+5c-6c$

$=-4b+4b+5c-6c$

$=5c-6c$

$=-c$

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