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2014-10-11T15:09:59+03:00
2014-10-11T15:14:42+03:00
X-25=25 =>x=50; 50-a=50 =>a=0; 5(z+10)=100 =>z+10=20 =>z=10; 5n+10=40 =>5n=30 =>n=6
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