solve the system: x+y=5
x-y=3
7431444.1994
7062659.5611
.7605
.3617
1449410311222.368785
148628883988.14125318
2898820615210.737570
297257767234.28250636
29+p=31
297257767234.28250636...
=30/1/2+15
