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If you would like to evaluate (7b - 10) / (-1) when b = 5, you can do this using the following steps:

b = 5
(7b - 10) / (-1) = (7 * 5 - 10) / (-1) = (35 - 10) / (-1) = 25 / (-1) = - 25

The correct result would be - 25.