Question 156024
10+(-4) = 6
Why?  If you gain $10, then lose $4 you end up with $6
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 -2(-6) = 12
Why? You twice did the opposite of losing $6; you end up with $12
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-7+7  = 0
Why? You lost $7, then you gained $7; you ended up even at zero.
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-0.25-4 = -4.25
Why?
You lost 25 cents; then you lost $4; you ended up $4.25 in the hole.
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-5+23 = 18
Why?  You lost 5 then gained 23 
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-15+(-9) = - 24
Why You lost 15, then lost 9
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Cheers,
Stan H.