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When m = - 6 / 1, the value of the algebraic formula M & # 178; - 9 / 21-5m-m & # 178; - 9 / M divided by M + 3 / M-M + 3 / M-3 is
[(M & # 178; - 9) of (21-5m) - (M & # 178; - 9) of (M] / [(M + 3) of (M - (M + 3) of (M-3)]
=[(M & # 178; - 9) of (21-5m-m)] / [(M + 3) of 3]
=[(M & # 178; - 9) of (21-6m)] × 3 of (M + 3)
=(M-3) (7-2m)
=-1 / 2 + (M-3)
=-2 + (- 1 / 6 - 1 / 3)
=-2 - (19 out of 6) 1 out of 6
=-2-6 / 19
=-2 and 6 / 19
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