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2014-11-12T21:37:14+02:00
175/[(13X-30)/3-10]=1(13x-30) : 3 - 10 = 175 : 1 
(13x-30) = 185 
13x - 30 = 185 x 3 
13x - 30 = 555
13x = 585 
x= 585 / 30 
x= 45
3 5 3