10x ÷ 15 = 5(2x ÷ 3) 
factor on the left side:
5(2x ÷ 3) = 5(2x ÷ 3)
 
8 ÷ 12x = 4(2 + 3x)
factor on the left side:
4(2 ÷ 3x) = 4(2 + 3x)
factor on the left side:
5(2x ÷ 3) = 5(2x ÷ 3)
8 ÷ 12x = 4(2 + 3x)
factor on the left side:
4(2 ÷ 3x) = 4(2 + 3x)
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I think it must be a typo.  As Sk4y said and you obviously thought, 8 div 12x = 4(2 div 3x)          
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It doesnt. 
 
8 ÷ 12x
=4(2÷3x)
      8 ÷ 12x
=4(2÷3x)
