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If \(\begin{pmatrix} 3 & 2 \\ 7 & x \end{pmatrix} \b...

If (327x)(23)=(1229), find x.

A.

5

B.

6

C.

7

D.

8

Correct answer is A

(327x)(23)=(1229)

(3×2+2×37×2+x×3)=(1229)

14+3x=29

3x=2914=15

x=5