[tex] \huge \color{gray} { \underbrace{ \overbrace{answer}}}[/tex]
[tex]4x(3a - b) + 2x(2a - 3b)[/tex]
[tex]12ax - 4bx + 2x \times (2a - 3b)[/tex]
[tex]12ax - 4bx + 4ax - 6bx[/tex]
[tex]16ax - 4bx - 6bx[/tex]
[tex] = 16ax - 10bx[/tex]
[tex] \huge \color{cyan}{ \tt{hope \: \: it \: \: helps}}[/tex]