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2014-05-21T23:33:35+03:00
B=a-143
a:b=2 rest 56⇒  a=2b+56
inlocuim a=2(a-143)+56
a=2a-286+56
a-2a=-230
-a=-230      ·-1
a=230
b=230-143
b=87
230:87=2 rest 56
7 4 7