Take $- a b + b c - c a f r o m b c - c a + a b$

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Solution

The value of the subtraction is calculated as,
$(b c - c a + a b) - (- a b + b c - c a)$
$= b c - b c - c a + c a + a b + a b$
We get,
$= 2 a b$
Hence, $(b c - c a + a b) - (- a b + b c - c a)$
$= 2 a b$

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