how much more is the sum of 7a-5b-8c and 4c-3b-5a than the sum of 2b-a+5c and 6a-9c-8b
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Step-by-step explanation:
6a -9c -8c
-a +2b+5c. SUM
5a -7b -3c
7a -5b -8c
-5a-3b+4c. SUM
2a-8b-4c
2a -8b -4c
5a -7b -3c. DIFFERENCE and sign change
-. +. +
-3a -b. -c
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