Question 1174050
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The rule is SIMPLE:



        when you see the sign " - " before parentheses,  you may take it off,  together with parentheses, 


        but then you  MUST  change the signs of the terms  (numbers)  inside these parentheses to opposite.



&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-3 - (-7) = -3 + 7 = 4.    &nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>



Solved, answered and explained.   &nbsp;&nbsp;&nbsp;&nbsp;And completed.