[78] x= 3.85 (3.8500000000000000888178419700125232338905)
[79] x= 3.9 (3.8999999999999999111821580299874767661095)
[80] x= 3.95 (3.9500000000000001776356839400250464677811)
[81] x= 4 (4.0000000000000000000000000000000000000000)