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2014-01-21T21:10:54+02:00
A+b=25
a-b=14=>a=14+b

14+b+b=25
2b=25-14
2b=11

b=5.5

a=14+5.5=19.5
1 5 1
2014-01-21T21:26:18+02:00
a+b=25
a-b=14=>a=14+b

14+b+b=25
2b=25-14
2b=11

b=5.5

a=14+5.5=19.5