What value of x would prove a||b? a. x = 6.9 12x+3 b. x = 6 C. x = 12 d. x = 4.2 21x-51,

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A: Solve by algebra

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Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.