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2014-09-21T14:26:13+03:00
3x - 21 - 5/4  = 2x - 2 + 7/4 =>
3x-2x = 21 - 2 + 7/4 + 5/4 =>
x = 19 + 12/4 =>
x = 19 + 3 
x = 22