Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

equation

A claim that two expressions are equal, joined by $=$ .

An equation states that two expressions are equal: $3x + 5 = 20$ . It's either true (for the right value(s) of the variable) or false.