А-(4а-11)+(9-2а)=20-5а

Question

А-(4а-11)+(9-2а)=20-5а

Answer 1

A-(4a-11)+(9-2a)=20-5a
a-4a+11+9-2a=20-5a
-5a+11+9=20-5a
-5a+20=20-5a
-5a+5a=20-20
0=0

Answer 2

a-4a+11+9-2a-20+5a=0

0=0