Bring together everything you've learned to solve linear equations — the final chapter of your Class 7 journey!
To solve an equation, isolate the unknown by performing the same operation on both sides, working in reverse order of how the expression was built.
Solve: 3x + 7 = 22
3x = 15, so x = 5
Solve: 2(x + 4) = 18
x + 4 = 9, so x = 5
Real situations become solvable once translated into an equation — assign a letter to the unknown, then write an equation matching the relationships described.
A number increased by 12 equals 30. Find the number.
x + 12 = 30, so x = 18
Twice a number, decreased by 9, equals 15. Find the number.
2x − 9 = 15, so 2x = 24, x = 12
1. Solve: 5x − 6 = 19
2. Solve: 4(x − 2) = 20
3. A number decreased by 15 equals 27. Find the number.
4. Three times a number, increased by 8, equals 32. Find the number.
5. A rectangle's length is twice its width, and its perimeter is 36cm. Find the width.
From Large Numbers Around Us to Finding the Unknown — the entire Class 7 Maths book, both Part 1 and Part 2, is done. Onwards to new challenges!
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