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2014-05-20T18:26:29+02:00
7x+3 = 24
7x+3-3 = 24-3
7x = 21
7x/7 = 21/7
x = 3

33
5x-7 = -11                +7
5x-7+7 = -11+7
5x = -4                   :7
5x/5 = -4/5
x = -4/5