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11 May, 08:02

How do I solve for 7y-4x=42 x=5y+9

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  1. 11 May, 11:57
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    x=-21 y=-6

    Step-by-step explanation:

    7y-4 (5y+9) = 42

    7y-20y-36=42

    -13y=78

    y=-6

    x=5 * (-6) + 9

    x=-30+9

    x=-21
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