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2014-10-09T01:42:19+03:00
A*b=672
(a+10)*b=992

a*b=672 deci a=672/b

(a+10)*b=992
(672/b+10)*b=992
672b/b+10*b=992
672+10b=992
10b=992-672
10b=320
b=320/10
b=32

a=672/32
a=21
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