Algebra practice question

Answer: 15

Add 9 to both sides: x = 6 + 9 = 15. The variable being on the right changes nothing.

Common wrong answers

If you answered 3

3 is 9 − 6, also subtracting. x − 9 = 6 means x is 9 MORE than 6.

If you answered 54

54 is 6 × 9; the equation subtracts 9, so undo it by adding.

If you answered -3

−3 is 6 − 9, subtracting the 9 instead of adding it. To undo 'minus 9', add 9.

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