Respuesta :

3 + ((-5) + 6) = (3 + (-5)) + 6

It's 
associative property of addition

The associative property of addition states that you can add regardless of how the numbers are grouped, result will state the same.
wikk
3 + ((-5) + 6) = (3 + (-5)) + 6

it's associative property because the expression is staying the same, but the parentheses move
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