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MIT 6.002 Circuits and Electronics, Spring 2007 19 Online
OpenStudy (anonymous):

Work out corner has5 more than 3 times as many excerise bikes as the gym together they have 21 bikes solve the equation x+3x+5 =21 to find the number of the bikes at work out corner.

OpenStudy (kenljw):

x + 3 x + 5 = 21 4 x + 5 = 21 4 x = 16 x = 4

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