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

$11(d+1)=4(d+8)$ (Use the distributive property, and multiply the number on the outside of the parenthesis to the numbers inside the parenthesis) $11d+11=4d+32$ (Subtract 11 on both sides) $11d=4d+21$ (Subtract 4d from both sides) $7d=21$ (Divide each side by 7) d=3