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2014-03-02T11:57:51+01:00
²x/3 -7 = 2 
x/3 = 2+ 7
x/3 = 9 
x = 9 /3 


5(x+ 4)= 0 
5x + 5 x 4 = 0 
5x + 20 = 0 
5x = -20 
x= -20/5