(6 - 2 / (1/10 2/1 / 7)) 4/1(6 - 2 / (0.1 0.2857)) 4/1(6 - 2 / 0.02857) 4/1(6 - 69.86) 4/1(-63.86) * 4/1-15.9433333...
(6 - 2 / (1/10 2/1 / 7)) 4/1
(6 - 2 / (0.1 0.2857)) 4/1
(6 - 2 / 0.02857) 4/1
(6 - 69.86) 4/1
(-63.86) * 4/1
-15.9433333...