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= (2 × a) (2 × -b) (2 × -c) dari a - b - c
= 2a - 2b - 2c dari a - b - c
= a - b - c - (2a - 2b - 2c)
= a - b - c - 2a + 2b + 2c
= a - 2a - b + 2b - c + 2c
= -2a + b + c