-18
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adding a negative is the same thing as subtracting a positive.
so -9 + -9 is just like -9-9 = -18
hope this helped
9+9+9+9 = 36
If I am correct, 9 plus 7 equals 112.
9+9+9+9+9+9+9=63
9 plus 7 equals 144. Generally, x plus y = x(x+y).
The additive property.