Question

a)5a-12a+5b+8b=

b)4(a-1)+5a+8=

c)-3a-3b+4a+4b=

Answer 1

Boa noite 

a)

5a - 12a + 5b + 8b = 13b - 7a

b)

4*(a - 1) + 5a + 8 
4a - 4 + 5a + 8 = 9a + 4 

c)

-3a - 3b + 4a + 4b = a + b