Answer

(a) 12 + (–32) – 25 = 12 – 32 – 25

= 12 – 57

= –45

(b) –21 – (+43) + 19 = –21 – 43 + 19

= –64 + 19

= –45

(c) 15 – (–32) + 17 = 15 + 32 + 17

= 64

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