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The sum of a number times 7 and 19 is at least 21
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The sum of a number times 7 and 19 is at least 21

User Viorel
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so 7x+19 has to be greater then or equal to 21
Subtract 19 from both sides to get 7x >_ 2
so × has to be greater than or equal to 2/7
User Sandeep Talabathula
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