Answer:
15
Explanation:
First add 20 to both sides to get x/3 = 5
Then multiply both sides by 3 to get 15.
You can check it by substituting it into the equation
15/3 - 20 = -15
5 - 20 = -15
-15 = -15
x/3 - 20 = -15
x/3 = -15 + 20
x/3 = 5
x = 15
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