E=mc2 rewrite the equation to solve for m
E=mc^2 can be re-written as m=E/(c^2) where m represents the mass.
That's a beautiful formula by the way.\(E=m{ c }^{ 2 }\\ \\ \frac { 1 }{ { c }^{ 2 } } \cdot E=m{ c }^{ 2 }\cdot \frac { 1 }{ { c }^{ 2 } } \\ \\ m=\frac { E }{ { c }^{ 2 } }\)