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2014-07-25T21:45:25+03:00
A-b=789

a:b=6 rest 4
a=6b+4

6b+4-b=789
5b+4=789

5b=789-4
5b=785
b=157

a=6*157+4=942+4=946
2014-07-25T21:47:15+03:00
A-b=789

a:b=6 rest 4 . 
⇒a=6b+4.

6b+4-b=789
5b=789-4
5b=785
b=785:4
b=157 . 

a=6b+4
a=6·157+4
a=946 . 
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