Yes.
-2 + -2 becomes -2 - 2 which is -4.
-2 - -2 become -2 + 2 which is 0.
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A + 2a = 3a
A negative+ a negative= to a negative number.
n + 2n = 3n
It does not. A negative number multiplied by a negative number equals a positive number.
No. it's not a prime number when x = 40, 41, 81,82 ...