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2014-04-28T16:57:28+03:00
5x-3=4x+9 
5x-4x=9+3
x=12

5(2x-8)+9=2x-13
10x-40+9=2x-13
10x-2x=40-9-13
8x=18
x=18/8
x=9/4
2 4 2