Question
Take − ab + bc − ca from bc − ca + ab.
✓
Answer
(bc − ca + ab) − (− ab + bc − ca)
= bc − ca + ab + ab − bc + ca
= bc − bc − ca + ca + ab + ab
= 2ab
= bc − ca + ab + ab − bc + ca
= bc − bc − ca + ca + ab + ab
= 2ab
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