Question

13-4*3:[2•11-1•5-(10•2-5•a)]+2•3=13

Answer 1

13-12:[22-5-(20-5•a)]+6=13
13-12:[17-(20-5•a)] =13-6
13-12:[17-(20-5•a)] =7
12:[17-(20-5•a)] =13-7
12:[17-(20-5•a)] =6
17-(20-5•a) =12:6
17-(20-5•a) =2
20-5•a=17-2
20-5•a=15
5•a=20-15
5•a=5
a=5:5
a=1

Sper ca te-am ajutat