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Sep 18, 2022
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If $\begin{bmatrix}a+b & c+d \\c-d & a-b \end{bmatrix}=\begin{bmatrix}6 & 8 \\12 & 4 \end{bmatrix}$ then c=?
Difficulty: Easy
A:
5
B:
10
C:
12
D:
20
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ID: 63273dbaca83163ac3a11a93