SOLUTION: how do i reduce this problem? -13 - 10 - 7

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Question 441058: how do i reduce this problem?
-13 - 10 - 7

Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
simply, just add negative numbers (same as positive)
+-13+-+10+-+7=+%28-13%29%2B%28+-+10%29%2B%28+-+7+%29=-30