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-14 - +7 - -25 = 4
-0.25 = -1/4
(5r - 4)(5r + 4)
the answer of negative 4 minus positive 21 is positive 25 because you leave the negative 4 as is, change the minus to a plus, and change positive 21 to negative 21. (Leave Change Change)
Remove the parentheses and change the sign of everything that was within them. Eg: 25 - ( 6 + 4 - 8 + 2) ( which is 25 - (4)) becomes 25 - 6 - 4 + 8 - 2 = 21