Use the expression 10m + 3 (n − 8) − 7 (m − 12) + 9n to find its simplified form and its factored form.
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Select the expression when simplified and when factored from the choices below.
A 3m + 12n − 36
B 4 (n + 3m + 56)
C 3 (m + 4n + 20)
D 12n + 3m + 60