Pretty cool. Unfortunately limited to simple linear equations.
"At current, PhotoMath supports solutions for four mathematical concepts: arithmetic expressions, fractions and decimals, powers and roots, and simple linear equations.
The app won’t help you solve a complex calculus problem, or a multi-variable algebraic expression (although it does support simple algebraic expressions), but for most simple math problems that you’d rather not solve because of time constraints or lack of motivation, the app works as promised."