2a+3b+4c,4a-7b+6c and -7a-6b+8c
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2a+3b+4c+4a-7b+6c -7a-6b+8c
like terms
2a+4a-7a
3b-7b-6b
4c+6c+8c
-1a-13b+18c
solved
god bless you
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