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2014-09-25T09:59:50+03:00
(5a - 2 + 32) : 3 = 500 : 100
         8
(5a + 30)  : 3 = 5
       8
5a + 30 = 5 * 3
     8
5a + 30 = 15 * 8
5a = 120 - 30
5a = 90
a = 18