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13 February, 21:04

What adds to 1 and multiples to - 90

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  1. 13 February, 21:22
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    +10 and - 9

    Step-by-step explanation:

    If we consider the multiples of - 90

    ± 1, ± 2, ± 3, ± 5, ± 6, ± 9, ± 10, ± 15, ± 30, ± 90

    The combination of multiples which multiply to - 90 and add to + 1 are

    + 10 and - 9

    since 10 * - 9 = - 90 and 10 - 9 = 1
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