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2014-05-05T15:09:23+03:00
A-b=5
a+b-(a-b)=40
a+b-5=40
a+b=40+5
a+b=45
a-b=5=>a=b+5

b+5+b=45
2b+5=45
2b=40
b=20

a=20+5
a=25
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