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2014-11-13T20:16:32+02:00
A+b+c=900
b=2a
c=b+85=2a+85
a+2a+2a+85=900
5a=900-85
5a=815
a=815:5
a=163
b=2a
b=2*163
b=326
c=b+85
c=326+85c=411

163+326+411=900
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