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Start with the Latin circle. You have sufficient information to determine how many students want both Latin and Spanish (1).
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Using this new information, you can work within the Spanish circle to determine how many students want both Spanish and French (4).
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Using this new information, you can work within the French circle to determine how many students want French only (7).
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The last step could be represented algebraically as
x + 4 + 3 + 2 + 5 + 8 + 1 = 30
x + 23 = 30
x = 7