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2014-09-21T15:02:11+03:00
{7+7x[7+3x(5+225/15-15]}-161={7+7x[7+3x(5+15-15)]}-161={7+7x[7+3x5)]}-161={7+7x(7+15)}-161=7+7x22-161=7+154-161=0
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