Answer:
12/7 or 1.71428571429
Explanation:
You have to isolate the variable to get the w by itself. It's right next to a 7 which also means 7 multiplied by w. We need to cancel out the seven to isolate the variable so to do this we divide by 7. We also need to do this to the other side of equation to keep it balanced.
-12 = 7w
/7 /7
-1.714...=w