4+3=7
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1 plus 1 equals one fact
4+5=9
The cube root of -1 ("minus 1" or "negative 1") is -1. In fact all odd-numbered roots (i.e., the fifth root, the seventh root, the ninth root, etc.) of -1 are -1.
Sobtract 1 from minus 9 and get minus 10.
-1 is the answer. With an odd number of -1s, we end up back where we started as each multiplication only switches from positive to negative.