Algebra, without the overwhelm
Build a strong foundation in equations and substitution.
An equation balances two equal expressions. To solve 3x + 5 = 20, subtract 5 from both sides: 3x = 15. Divide both sides by 3: x = 5.
Check your answer by substitution: 3(5) + 5 = 20. Try 4x + 7 = 31; the answer is x = 6.