Formula calculation: 3 right quarter + (- 2 right three fifths) + right 5 three fifths (- 8 right two fifths)

Formula calculation: 3 right quarter + (- 2 right three fifths) + right 5 three fifths (- 8 right two fifths)

3 right quarter + (- 2 right three fifths) + right five three fifths (- 8 right two fifths)
=13/4-13/5+23/4-42/5=13/4+23/4-(13/5+42/5)=9-11=-2

Two out of seven, two out of five, two out of six, three out of four, three out of five, four out of five

As the denominators are different, so you might as well simplify them and turn them into decimals
Two out of seven equals 0.2857143
Two fifths is 0.4
Two sixths is 0.3333
Three quarters equals 0.75
Three fifths is 0.6
Four fifths is 0.8
So they are four fifths, three fourths, three fifths, two fifths, two sixths and two sevens