Hey there!
[tex]\bold{5(3x+4)-4}\\\bold{5(3x)+5(4)-4}\\\bold{5(3x)=15x}\\\bold{5(4)=20}\\\bold{15x+20-4}\\\bold{COMBINE\ your\ LIKE\ TERMS\downarrow}\\\bold{15x +(20-4)}\\\bold{20 -4=16}\\\bold{= 15x +16}\\\boxed{\boxed{\bold{Answer: 15x+16}}}\huge\checkmark[/tex]
Good luck on your assignment and enjoy your day!
~[tex]\frak{Amphitrite1040:)}[/tex]