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b = - 3
c = 5
(a + b + c) x (a - b)
(- 5 + (- 3) + 5) x (- 5 - (- 3))
(- 5 - 3 + 5) x (- 5 + 3)
(- 8 + 5) x (- 2)
(- 3) x (- 2)
6
= (-5+(-3)+5) x (-5-(-3)
= (-5-3+5) x (-5+3)
= (-8+5) x (-2)
= -3 x (-2)
= 6