Раскройте скобки: 10x+(8x-(6x+4)).

\[10x + \left( 8x - (6x + 4) \right) =\]

\[= 10x + \ (8x - 6x - 4) = 10x + (2x - 4) =\]

\[= 10x + \ 2x - 4 = 12x - 4.\]