Geometry: Common Core (15th Edition)

We start by distributing in the left side of the equation, giving: $2x+6-1=7x$. To isolate $x$ and its coefficient, we subtract 2x from both sides, giving $6-1=5x$. Simplifying the left side gives $5=5x$. To fully isolate $x$, we divide both sides by 5, giving $1=x$.