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2014-11-08T22:03:54+02:00
A+b=56
a=b/7
b/7+b=56
(b+7b)/7=56
8b/7=56
8b=56·7
b=392/8
b=49
a=56-b
a=56-49
a=7
7+49=56
1 5 1
2014-11-08T23:30:03+02:00
A+b=56
a=b/7
b/7+b=56
b+7b=56*7
8b=56*7
b=56*7/8
b=49
a=56-49=7