Solve for w
1200 - 40w = 120 + 50w
Group our variables -40w and 50w
subtract 50w from both sides
-40w + 1200 - 50w = 50w + 120 - 50w
-90w + 1200 = 120
| 1200w | |
| 1200 |
| = |
| -40 |
| 1200 |
Group our constants 1200 and 120.
subtract 1200 from both sides
-90w + 1200 - 1200 = 120 - 1200
-90w = -1080
| -90w | |
| -90 |
| = |
| -1080 |
| -90 |
w = 12