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A two-step equation such as 3x + 5 = 26 has two things done to x: multiplied by 3, then 5 added. Undo them in reverse order — take away 5, then divide by 3 — and always do the same to both sides. Word problems turn into equations once you call the unknown number x.
✓ You passed this lesson’s test.
Undo in reverse — “undo the adding or subtracting first, then the multiplying or dividing”
Use it for: Ages, "think of a number" puzzles, prices and the simple equations chapter of Class 7 maths.
Check: 3 × 7 + 5 = 26 ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 sums. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the 🧩 Two-Step Solver badge when you pass — and a certificate when you finish all 8 lessons of Part 7 · Class 7. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
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