Довести тотожность a-(4a-11)+(9-2a)=2a-5a ; 6(3b-4)-5(3b-11)+2=3b+33

Question

Довести тотожность a-(4a-11)+(9-2a)=2a-5a ; 6(3b-4)-5(3b-11)+2=3b+33

Answer 1

1)a-(4a-11)+(9-2a)=2a-5a
-a-(4a-11)+9-2a=-3a
5a+20=-3a
-5a+3-20
2a=-20
a=10

2) 6(3b-4)-5(3b-11)+2=3b+33
18b-24-15b+55=3b+33
3b-22+55=3b+33
3b+3b=33-33
0=0

Comments

2) 6(3b-4)-5(3b-11)+2=3b+33