Introduction to Algebra
Algebra uses letters to represent unknown numbers. An expression like 3x + 5 means "3 times some number, plus 5".
Solving simple equations
To solve 2x + 4 = 10:
- Subtract 4 from both sides:
2x = 6 - Divide both sides by 2:
x = 3
Practice
Solve: 5x - 3 = 12, 3(x + 2) = 15.