Question

Cat este a?
32-5(20:a-1)+17=29

Answer 1

32-5*(20:a-1)=29-17
32-5*(20:a-1)=12
5*(20:a-1)=32-12
5*(20:a-1)=20
20:a-1=20:5
20:a-1=4
20:a=4+1
20:a=5
a=20:5
a=4

Answer 2

32-5(20 supra a-1)+17=29
32-100 supra a +5+17=29
54-100supra a=29
-100 supra a=29-54
-100 supra a=-25
100=25a => 25a=100 => a=100÷25 => a=4