<span> 6.1+n+3.5=9.6+n</span>
///////////
(1600+t) :80 = 60
1600+t = 60*80
1600+t=4800
t=4800-1600
t=3200
1300-(d-678)=400
1300-d+678=400
d=1300+678-400
d=1578
23+15+0+7=38+0+7=45
23-15+0+7=8+0+7=15
23+15-0+7=45
23-15-0+7=15
23+15+0-7=31
23-15+0-7=1
36555 63555 36665 36655 36565 63665 63565 63655 53665 53555 53565 53655 35555 35665 35655 35565 36335 65335..................