Does anybody know the answer to it? It is very confusing for me. It is 6th grade.

Answer:
13a+16b+12
Step-by-step explanation:
5(a+3b)+b+8a+12
= 5a +15b+b+8a+12
=5a +8a+15b+b+12
=13a+16b+12
Answer:
13a+16b+12
Step-by-step explanation:
5(a+3b)+b+8a+12
= 5a +15b+b+8a+12
=5a +8a+15b+b+12
=13a+16b+12