It is -6 minus -9 = +3. That's because minus -9 is the same as +9.
-12
-9 minus -2 is -7
-6 - 5 = -11
0.000244140625
f434
-11
Just move the decimal place 6 to the left... 2.2*10^(-6) = 0.0000022
6=5. Which is not a correct problem, but technically is a problem if you look at the definition for "problem"
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a minus take away a minus makes a minus