• 5

• -5

• 5 or -5

• no solution

• 6

• -6

• 1/6

• no solution

• subtract 2
• add 2
• add 4
• divide by 2
• Split into two equations
• Solve both equations

• Subtract 2
• divide by 3
• split into two equations
• Solve both equations
• subtract 3
• subtract 4

• no solution

• -8

Mathematical Equivalence

ON

• no solution

• 7

• -7

• 14

• 0

• -4

• 4

• 2

• -2

• 3

• 4

• -1

• 1

• -4

• 5.5