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Do the bit in brackets first.
-29-9=-38.
-38--16 is a double negative so it's an addition. -38+16= -22.
-22+-17=-39.
So,
-47--39=-8
-8+20=12.
-29-9=-38.
-38--16 is a double negative so it's an addition. -38+16= -22.
-22+-17=-39.
So,
-47--39=-8
-8+20=12.
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