Question

what is 2-x=13

Answer 1

\[\begin{align}
2-x&=13\\
2-x\color{blue}{+x}&=13\color{blue}{+x}\\
2&=13+x\\
2\color{blue}{-13}&=13\color{blue}{-13}+x\\
-11&=x
\end{align}\]

Answer 2

-x=13-2
-x=11
-x/-1=11/-1
x=-11

Answer 3

It is an equation.

Answer 4

It's also a line.