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Upper secondary · Algebra

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What to practise

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Original educational content

Learn the concept

Learning objective: Solve simple linear equations.

Preserve equality by performing the same operation on both sides.

Worked example

3x + 5 = 20 → 3x = 15 → x = 5

Practise and check

Activity 1

2x + 7 = 19

Show step-by-step solution

2x = 12 → x = 6.

Activity 2

5x − 4 = 21

Show step-by-step solution

5x = 25 → x = 5.

Activity 3

4(x − 2) = 12

Show step-by-step solution

x − 2 = 3 → x = 5.

Learning tip: Preserve equality by performing the same operation on both sides.

Practice · Interactive labs

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Learning guide

Choose a course suitable for your level and learn at your own pace. Explore key ideas, practise with examples and check your results.

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