a+b-c-b-c+2c-a

a+b-c-b-c+2c-a
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2 Answers

a + b - c - b - c + 2c - a

Group the a's together like this:

a - a + b - c - b - c + 2c

Now group the b's together like this:

a - a + b - b - c - c + 2c

0 + 0 + 0

0

(everything cancels out)
by Level 13 User (103k points)
zero
by Level 8 User (35.3k points)

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