Question

а+9=6+8 а-7=15-9 18-а=13-4

Answer 1

a+9=6+8
a+9=14
a=14-9
a=5

a-7=15-9
a-7=6
a=6+7
a=13

18-a=13-4
18-a=9
a=18-9
a=9