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18 May, 02:22

If 3y+5=7x, then 21y-49x=?

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  1. 18 May, 02:52
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    3y+5=7x

    3y=7x-5

    y = (7x-5) / 3

    ...

    21y-49x becomes

    7 (7x-5) - 49x

    49x-35-49x

    -35
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