• x = 6
• x = 2
• x = 4
• x = 10

• x = -2
• x = 0
• x = -1

• x = 5

• x = 5
• x = 9
• x = 12
• x = -3

• x = -3
• x = 10
• x = 0
• x = 2

• x = y + 3
• x = 3y

• x = 3 - y
• x = y - 3

• x = -5y
• x = 2y
• x = -10y
• x = 5y

• b = a + 12
• b = a - 12
• b = 12 - a

• n = 2(m-S)

• ℓ = πr

• ℓ = 2r

• ℓ = 2πr

• c =5 (a - 5b)