## Algebra 1: Common Core (15th Edition)

$x=4$
$5x-1=x+15 \\\\ 4x-1=15 \\\\ 4x=16 \\\\ x=4$ We first subtract x on both sides. Next, we add 1 to both sides. Finally, we divide by 4 to get that x=4. We plug 4 in for x and confirm that our answer is, indeed, correct.