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Solve (x+1) + (x+4) + (x+7) + ... + (x+28) = 155

 Dec 16, 2019
 #1
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[28 - 1] / 3 + 1 = 10 terms for the sequence

 

1 + 4 +7 +......+ 28 =145

 

10x + 145 = 155

 

10x =155 - 145

 

x = 1

 Dec 16, 2019

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