Add 3a-2b+5c+7
5b-3c-4
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(3a - 2b + 5c + 7 )+( 5b - 3c - 4 )
= 3a - 2b + 5c + 7 + 5b - 3c -4
= 3a - 2b + 5b + 5c - 3c + 7 - 4
= 3a + 3b + 3c + 3
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