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2013-09-26T17:54:11+02:00
9x + 6= 12x - 48
48+6 =12x -9x
54=3x
54/3 = x

2( 7x -2) = 3( 7x + 3)
14x - 4 = 21x + 9
7x=13
x = 13/7