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Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.
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One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.
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What decimal is equivalent to 4.02 percent? ?...
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