Mathematics · Grades 6–9
Expressions, equations and structure · Revision card
Simplifying an expression and solving an equation are different tasks.
Understand the idea
Name the task
Simplifying an expression and solving an equation are different tasks.
Preserve equality
Apply equivalent operations to both sides when solving.
Use substitution
Check a proposed solution in the original equation.
Worked examples
Which is an equation rather than an expression?
An equation includes an equality statement.
3x + 2 = 11
Find x if 4(x − 2) = 20.
Divide by 4 to obtain x − 2 = 5, then add 2.
7
Explain without looking
- Which substitution proves that x = 3 solves 2x + 1 = 7?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Preview material · independent educational review required. Grade bands are approximate, not official curriculum alignment.