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Solve \(7^x + 7^{x + 1} + 7^{x + 2} + 7^{x + 3} = 2800\)

 Jun 10, 2020
 #1
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= 7^x   +  7 * 7^x    +   49 * 7^x   + 343 * 7^x = 2800

= 400* 7^x = 2800

7^x = 7

x = 1

 Jun 10, 2020

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