(edit: nvm about whatever i wrote down)
Answer:
21 gallons.
Explanation:
Let the number of gallons that the tank holds be x gallons.
1/2x + 7 = 5/6 x
5/6x - 1/2x = 7
5/6 x - 3/6 x = 7
1/3 x = 7
x = 21.
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