Who ever answers will get brainlest and revive 50 points ( and if u can put answers to whole assessment that will be fine to ;)
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First add the two fractions inside parenthesis:
5/7 - 6/14
Rewrite 5/7 to have a common denominator:
5/7 = 10/14
Now you have 10/14 - 6/14
10-6 = 4
The answer is 4/14, which can be reduced to 2/7