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2014-10-27T15:58:31+02:00
A+b=27,8
a-b=1,2
----------------
a+b+a-b=27,8+1,2
2a=29
a=14,5

b=27,8-14,5=13,3


2014-10-27T16:00:20+02:00
A+b=27
a-b=1
a+b+a-b=28
2a=28
a=14
14+b=27
b=13
a+b=8
a-b=2
a+b+a-b=10
2a=10
a=5
5+b=8
b=3