Answer:
[tex] \boxed{ \bold{ \huge{ \boxed{ \sf{16z + 12}}}}}[/tex]
Step-by-step explanation:
[tex] \sf{(4z + 3) + (4z + 3) + (4z + 3) + (4z + 3)}[/tex]
Remove the unnecessary parentheses
[tex] \sf{4z + 3 + 4z + 3 + 4z + 3 + 4z + 3}[/tex]
Collect like terms
Only the coefficients of like terms can be added or subtracted
[tex] \sf{4z + 4z + 4z + 4z + 3 + 3 + 3 + 3}[/tex]
[tex] \sf{16z + 3 + 3 + 3 + 3}[/tex]
Add the numbers
[tex] \sf{16z + 12}[/tex]
Hope I helped!
Best regards! :D