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18 June, 04:41

How to solve 21=3x+3y

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  1. 18 June, 04:43
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    x+y=7

    Step-by-step explanation:

    ok so first you have to divide 21 by three and then both threes by three so its just x+y and then 21/3 is 7 so the answer is x+y=7
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