-0.2 + (1/6) + (-8 1/15) = -0.2 + 0.1667 + (-8.0667) = -8.1
6.7 + (2 1/3 - 9 2/5) = 6.7 + (2.3333 - 9.4) = 6.7 + (-7.0667) = -0.3667
-0.2 + (1/6) + (-8 1/15) = -0.2 + 0.1667 + (-8.0667) = -8.1
6.7 + (2 1/3 - 9 2/5) = 6.7 + (2.3333 - 9.4) = 6.7 + (-7.0667) = -0.3667