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Math / Algebra / Grade 7 / ml701

Solve Equations by Undoing Operations

Keep both sides equal while solving one- and two-step equations.

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5 questions0m 0s
Learn the skill

Undo addition or subtraction, then multiplication or division. Perform the same operation on both sides. Substitute your solution into the original equation to check it.

Worked example

For 3x + 4 = 19, subtract 4 on both sides to get 3x = 15, then divide by 3 to get x = 5. Check: 3 x 5 + 4 = 19.

1. Solve x + 9 = 23. What is x?
2. Solve 5x = 40. What is x?
3. Solve 2x + 7 = 25. What is x?
4. Solve 4x - 6 = 18. What is x?
5. Solve x/3 + 5 = 1. What is x?