Subtract 2a-3b+4c from the sum of a+3b-4c and -2b+3c-a
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{(a+3b-4b)+(-2b+3c-a)} - 2a-3b+4c
» {a+3b-4b-2b+3c-a} - (2a-3b+4c)
» {-b+3c} - (2a-3b+4c)
» -b+3c-2a+3b-4c
» -b+3b+3c-4c-2a
» 2b - c - 2a
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