solve using cramer's rule 3m+2n=10 and m+2n=4

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  1. Det:
    3 2
    1 2 -----> 6-2 = 4

    10 2
    4 2 ----> 20-8 = 12

    3 10
    1 4 ---> (12 - 10) = 2

    m = 12/4 = 3
    n = 2/4 = 1/2

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