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9 December, 09:23

If 2s + 10r = 2 (2s-5r) = 42, then what is the value of r?

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  1. 9 December, 09:50
    0
    R=7/5

    You can list two equations:

    2s+10r=42 and 4s-10r=42.

    Then try to delete S, you will get r
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