11. -100=w-105 Solve: -100-105 12. so

## Step 1: Add 105 to both sides<br />### To isolate $w$, we add 105 to both sides of the equation $-100 = w - 105$. This cancels out the -105 on the right side.<br />## Step 2: Simplify<br />### $-100 + 105 = w - 105 + 105$ simplifies to $5 = w$.