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2014-10-16T10:01:56+03:00
A) 25a+4b1 = 738
a+1=8 => a=7
5+b = 13 => b=8

b) 1b3+c5a=1080
3+a=10 => a=7
b+5=8-7 => b=7-5 => b=2
1+c=10 => c=9
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