a negative 15
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3 + -9 = 3 - 9 = -6 (negative 6)
negative 9
3 raised to negative 2 would be -9 plus 6 to the negative 1 which is -6 so -9+-6=-15
9 + (-6) = 3 which would be the same as 9 - 6 = 3
In the equation x + 9 = 6, x is negative.