\((8x+6)-(x+4)\)
lets just focus on the side of the equation after the negative for now..
first, distribute the negative...
\(-(x+4) \\ -x-4\)
now lets add this back to the original...
\(8x+6 - x -4\)
add like terms...
\(7x+2\)
and there we have it fully simplified!