Question

X - 20 = 20 - 10

Answer 1

X - 20 = 20 - 10

X - 20 = 10

X       = 10 + 20

X       = 30

Answer 2

X - 20 = 20 - 10

X - 20 = 10

X       = 10 + 20

X       = 30

Answer 3

X - 20 = 20 - 10

X - 20 = 10

X       = 10 + 20

X       = 30