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29 January, 16:31

How to factor 21-7t+3r-rt

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  1. 29 January, 17:08
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    21 - 7t + 3r - rt

    Group:

    (21 - 7t) + (3r - rt)

    Factor out the common factors:

    7 (3 - t) + r (3 - t)

    Use the distributive property:

    (3 - t) (7 + r)
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