Question

quadrado +9 =15
3+quadrado=5
quadrado-4=1
quadrado-8=2
10-quadrado=6​

Answer 1

x+9=15

x= 15-9

x= 6

3+x=5

x=5-3

x=2

x-4=1

x=1+4

x=5

x-8=2

x=2+8

x=10

10-x=6

-x=6-10 .(-1)

x=-6+10

x=4