PuzzleM8 Learning games for families

One-step equations

Solve x + 5 = 9

The aim is to get x on its own. Whatever we do to one side, we do to the other, so the equation stays balanced. This one takes 1 step.

  1. x + 5 = 9The question.

  2. Step 1: Subtract 5 on both sides −5

    On the left, the x part has + 5 with it. Take 5 away from both sides to get rid of it.

    x = 4

    On the left, the 5 cancels out. x is on its own. x = 4.

    + 5 is undone by − 5.

Answer: x = 4

Check it

Put x = 4 back into the question. If both sides come to the same number, the answer is right.

Left side: x + 5 → 4 + 5 = 9

Right side: 9 → 9

✓ Both sides are 9, so x = 4 is right.

Now try it yourself

Solve this one in Algebra Balance. You choose each step, and it explains what happened, with hints if you get stuck.

Practise this in Algebra Balance

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