# How do you solve 1 + X = 3?

Subtract $\textcolor{red}{1}$ from each side of the equation to solve for $X$:
$1 + X - \textcolor{red}{1} = 3 - \textcolor{red}{1}$
$1 - \textcolor{red}{1} + X = 2$
$0 + X = 2$
$X = 2$