Mathematics, 04.12.2020 21:30, xxcynthistxx

Which of the following expressions is not in its simplest form? m + 3 n + 6 mn - 4
9 m + 7 n - 6 mn + 4
7 m - 9 n - 6 mn + 4
9 m + 7 n - 6 mn + 4 m

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Which of the following expressions is not in its simplest form? m + 3 n + 6 mn - 4
9 m + 7 n...