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27 December, 18:24

23. 10c2 - 21c = - 4c + 6

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  1. 27 December, 19:07
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    c = 2 or c = - 3/10

    Step-by-step explanation:

    23. 10c2 - 21c = - 4c + 6

    10*cc - 21c = - 4c + 6

    10cc - 21c + 4c - 6 = 0

    10cc - 17c - 6 = 0

    c = 17/20 + root (17*17 - 4*10 * (-6)) / 20

    c = 17/20 + 23/20

    c = 2 or c = - 6/20 = - 3/10
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