Answered

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how much is the sum of -21 and 16 more than their difference

Sagot :

(-21 + 16) - (-21 - 16) = N
(-5) - ( -37) = N
(-5) + ( + 37 ) = N   ⇒ Change the sign of the subtrahend, then proceed to
                                  integers' addition rule
N = 32
The answer is 32. 

Note:  The question "how much more" is first value THAN  the "second value" means getting their difference.

Example:  How much more is 50 than 20?
Subtract:
50 - 20 = 30.

Answer:  50 is to 30 more than 20.