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2014-11-18T09:41:46+02:00
(a+b)/2=84
a+b=168
a=18+b
b+18+b=168
2b=150
b=75
a=168-75=93

2014-11-18T09:46:46+02:00
(a+b)/2=84
a+b=168
a=18+b
b+18+b=168
2b=150
b=75
a=168-75=93