how would you simplify 
would the lcd be (x+2)(x-4) then you would get
3(x-4)+7(x+2)
3x+12+7x+14
10x+26
but im not sure
Yes, that's the LCD, but 3(x - 4) IS NOT 3x + 12, and you forgot that the LCD should be included as this is not an EQUATION to be solved, but an EXPRESSION to be simplified.

------ Multiplying by LCD, (x + 2)(x - 4)
