what is 12x>5(x-4)?
You can treat > like =, but you must remember it does not mean =.
12x > 5x - 20
7x > -20
-20/7 < x
So x must be larger than -20/7, but could be any where from -19/7 to positive infinity.
12x>5(x-4)?
12x>5x-20
7x>-20
x>(-20/7)