Question

Помогите решить: 1) 3(a+4)+4(a-3)= 2) 2(b+7)-3(b+1)=

Answer 1

1) 3(a+4)+4(a-3) = 3a+12+4a-12 = 7a

2) 2(b+7)-3(b+1) = 2b+14-3b-3 = -b+11