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2014-09-13T16:33:05+03:00
5*N+245=845
5N+245=845
5N=845-245
5N=600
N=600:5
N=120

54:N+67*5=344
54:N+335=344
54:N=344-335
54:N=9
N=54:9
N=6

N:3*8=616
N:24=616
N=616*24
N=14784

894-N:4=833
894-833=N:4
61=N:4
N=61:4
N=15 rest1
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