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18 July, 08:30

If 7a+20b=28-b, what is the value of a in terms of b?

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  1. 18 July, 08:39
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    7a+20b = 28-b

    7a = 28-b-20b

    7a = 28-21b

    a = 28/7 - 21/7 b = 4-3b
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